Best Email Security Solutions
Here's our list of the best email security solutions to help you protect your business.
Written by
Joel Witts
Technical Review by
Craig MacAlpine
Quick Summary
For straightforward spam filtering, TitanHQ Email Security delivers a 99.99% spam catch rate with remarkably low false positives, simple setup and management, and competitive pricing. Some users report email delivery delays during processing spikes.
If phishing bypasses traditional filters, IRONSCALES combines AI detection with crowdsourced human intelligence while deploys without MX changes requiring zero disruption. It’s not designed as a full spam filtering replacement.
When you need enterprise-grade but scaled for SMBs, Proofpoint Essentials delivers effective threat detection with low false positives, API deployment avoiding MX changes, and daily digest with one-click triage actions. Multiple admin consoles create a fragmented experience.
Email remains your organization’s largest attack surface. Phishing, business email compromise, and ransomware all start with a compromised inbox. The challenge isn’t finding an email security solution, it’s finding one that catches real threats without creating friction that your team works around.
Traditional secure email gateways ruled the market for two decades, but cloud-native productivity suites changed the game. Bolting legacy SEGs onto Microsoft 365 or Google Workspace means processing mail twice, managing multiple security policies, and explaining to your team why they’re waiting for email while attackers move fast. Modern architectures call for solutions that understand modern cloud environments instead of treating them as afterthoughts.
We evaluated multiple email security solutions across deployment models, threat detection accuracy, integration depth, and operational overhead. We evaluated how each handles phishing, business email compromise and ransomware delivery, plus data exfiltration. We also reviewed customer experiences to identify where vendor claims diverge from real-world performance. What we found: the gap between marketing materials and actual operational experience is substantial. Several platforms deliver strong protection for their intended use case but struggle outside their comfort zone.
This guide gives you the testing framework and decision logic to match the right email security solution to your environment, threat model, and team capacity.
Our Recommendations
Your choice depends on whether you need traditional gateway filtering, behavioral AI detection, or integrated compliance tools.
- Best For Centralized Management: TitanHQ Email Security 99.99% spam catch rate with near-zero false positives reduces inbox noise significantly.
- Best For Cost Efficiency: IRONSCALES Catches phishing attacks that bypass traditional secure email gateways consistently.
- Best For Performance: Proofpoint Essentials Effective threat detection with low false positive rates across spam and phishing.
- Best For Advanced Features: Material Security Deploys in under 30 minutes without touching MX records or requiring complex configuration.
- Best For Enterprise Scale: Abnormal AI Behavioral AI catches BEC and phishing attacks that traditional gateways miss entirely.
TitanHQ is a secure email gateway built for SMBs and MSPs who need straightforward spam filtering without enterprise complexity. The platform hangs its hat on a 99.99% spam catch rate with remarkably low false positives.
Multi-Layer Protection That Actually Works
We found the multi-layered approach covers the bases well. Inbound and outbound scanning, attachment sandboxing, SPF/DKIM/DMARC checks, and CEO impersonation defense all come standard. The phishing protection caught what we threw at it.
Real-time scanning keeps pace with mail flow. Data leak prevention rules are customizable, which matters if you’re in regulated industries. Office 365 integration is smooth, setup takes minutes, not hours.
What Customers Are Saying
The interface gets consistent praise. System admins highlight how easy it is to block specific domains or addresses without jumping through hoops. One MSP has run it for four years managing multiple client environments without major issues.
That said, delivery delays have surfaced for some users.
Right Fit at the Right Price
At $1.95 per user monthly (at 250 users), this is cost-effective protection. We think it’s ideal if you’re an SMB or MSP wanting solid inbound filtering without a steep learning curve. If you need advanced outbound DLP or enterprise-scale features, you’ll want to look elsewhere.
For straightforward email security that stays out of your way, TitanHQ delivers.
Strengths
- 99.99% spam catch rate with near-zero false positives reduces inbox noise significantly
- Simple setup and management interface keeps admin overhead low
- Competitive pricing makes enterprise-grade filtering accessible to smaller organizations
- CEO impersonation and phishing defenses address current threat trends directly
Cautions
- According to some user reviews, email delivery delays during processing spikes
- Some users mention that the cloud version lacks certain features available in on-premise deployment
IRONSCALES targets organizations drowning in phishing attempts that slip past standard email filters. It combines AI detection with crowdsourced human intelligence to catch threats that gateway solutions miss.
AI That Learns From Your Users
The platform’s differentiator is how it uses employee reports to train its detection engine. When someone flags a suspicious email, that intelligence feeds back into the system across their entire customer base. We found the “report phish” button actually gets used because it’s simple and employees see results. Malicious emails get automatically pulled from inboxes organization-wide, often within minutes of the first report.
Integration is painless. No MX record changes required for Office 365 or G Suite deployments. You’re up and running without rerouting mail flow or disrupting existing spam filters.
What Customers Are Saying
Users consistently highlight catch rates for threats their previous solutions missed entirely. A large banking organization noted they’re finding attacks their prior platform couldn’t identify. The security awareness training and phishing simulations get positive marks for engagement, though the platform’s strength is really detection and remediation.
Customer success teams get strong praise. Multiple organizations mentioned responsive support and proactive check-ins during deployment and beyond.
Where it Fits Your Stack
We think IRONSCALES works best as a complement to your existing email security, not a replacement. If you need better spam filtering, look elsewhere. If phishing, BEC, and social engineering are your pain points, this addresses them directly.
The crowdsourced approach means smaller organizations benefit from threat intelligence gathered across larger deployments. You’ll want this if your team struggles with phishing dwell time or needs to improve user reporting habits.
Strengths
- Catches phishing attacks that bypass traditional secure email gateways consistently
- Deploys without MX changes, meaning zero disruption to existing mail flow
- User-reported threats automatically remediate across the entire organization
- Security awareness training integrates directly with real threat data
Cautions
- Not designed as a full spam filtering replacement
Proofpoint Essentials delivers enterprise-grade email security scaled down for small and mid-sized businesses. It combines threat detection, archiving, encryption, and continuity in one package, backed by Proofpoint’s massive threat intelligence network.
Threat Detection That Actually Works
We found the spam and threat detection genuinely effective, with minimal false positives disrupting legitimate email. URL defense scans links before and after delivery, catching delayed attacks. The platform processes over 100 billion data points daily through Proofpoint’s global intelligence network.
Business email compromise protection and dynamic content filtering round out the core defenses. One-click message pull lets admins yank suspicious emails from inboxes fast.
Deployment Flexibility
You can deploy as a traditional cloud gateway or connect via API without touching MX records. We saw the admin console offers granular controls and solid reporting. The interface takes some getting used to, but the simplicity grows on you.
What Users Say Long-Term
Customers consistently praise the daily digest emails with single-click actions. One-click release or block saves real time versus manual triage. The threat data available for investigations is extensive and useful for building broader detections.
The complaints cluster around the interface. Multiple admin consoles frustrate users who want everything consolidated. SIEM integrations and API support feel limited for teams trying to centralize data. Sales support after implementation can disappear.
Right Fit for Growing Teams
If you’re a small or mid-sized org wanting Proofpoint’s detection capabilities without enterprise complexity, this fits. You get proven threat intelligence at a fraction of the cost. Just know that advanced features live in higher tiers, and you’ll need patience with the interface consolidation.
Strengths
- Effective threat detection with low false positive rates across spam and phishing
- API deployment option means no MX record changes required
- Daily digest with one-click actions speeds up routine email triage significantly
- Enterprise-grade intelligence at SMB-friendly pricing starting around $36 per user
Cautions
- Some users mention that multiple admin consoles create a fragmented management experience
- According to customer feedback, limited SIEM and API integrations complicate security data consolidation
Material Security locks down M365 and Google Workspace with automated detection and response for email, files, and accounts. It’s built for teams who want phishing and BEC protection without the complexity of traditional SEGs.
Beyond the Inbox
We found Material’s approach refreshingly different. Instead of just scanning inbound mail, it scans your entire email history to find sensitive data like tax documents or PHI sitting in old messages. Then it wraps MFA around access to those specific emails.
The “speedbump” technology caught our attention. When Material detects a threat, it adds authentication friction that slows attackers even if they’ve already compromised an account. Real-time identity protection spots password reset links and 2FA codes in emails, adding another layer before someone can hijack access.
What Customers Are Saying
Customers love the automatic clustering of similar malicious messages across the organization. Security teams can remediate at scale without manual investigation for each variant. The user-facing “report suspicious” button is simple enough that employees actually use it.
Some users flagged that the ticketing dashboard needs polish.
Does it Fit Your Environment?
We think Material makes sense if you’re running M365 or Google Workspace and want one platform covering email, data, and identity risks. It treats Google Workspace as a first-party integration, not an afterthought. Deployment takes under 30 minutes with no MX record changes.
If you need protection beyond cloud productivity suites, you’ll need additional tools. But for its target use case, Material delivers.
Strengths
- Deploys in under 30 minutes without touching MX records or requiring complex configuration
- Automatically clusters similar threats across your org, cutting investigation time significantly
- MFA controls on sensitive historical emails provide protection even after account compromise
- Support team responds fast and iterates on product feedback quickly
Cautions
- Some users report that ticketing dashboard lacks interactive drill-down capabilities for detailed investigation
- Some customer reviews note that initial setup may overwhelm teams without dedicated security engineers
Abnormal AI
Abnormal AI is an AI-native email security platform built for organizations running Microsoft 365 or Google Workspace. It focuses on catching socially-engineered attacks that traditional gateways miss.
Behavioral Detection That Actually Works
We found the anomaly detection engine genuinely impressive. It analyzes over 45,000 signals per message to spot phishing, business email compromise, and account takeover attempts. The API-level integration with M365 and Google Workspace means it sees email behavior patterns that gateway solutions can’t access.
Protection extends beyond email into connected SaaS apps like Slack, Workday, and Salesforce. This matters when attackers pivot from compromised email accounts into other platforms.
What Customers Are Saying
Customers consistently praise detection accuracy. Teams report spending far less time managing email queues and chasing false positives compared to traditional gateways like Mimecast or Barracuda. Setup is straightforward, a few MX record changes and coordination with Abnormal’s team.
Users have flagged the interface could be more responsive, and some want outbound email monitoring added.
Best Fit for M365 and Google Shops
If you’re running M365 or Google Workspace and tired of babysitting your email gateway, this deserves serious consideration. We think it’s particularly strong for organizations dealing with sophisticated social engineering attempts. The behavioral AI approach catches attacks that signature-based tools miss entirely.
It won’t suit organizations using other email platforms. But for its target audience, it delivers real operational efficiency alongside strong protection.
Strengths
- Behavioral AI catches BEC and phishing attacks that traditional gateways miss entirely
- API integration provides visibility into email patterns signature tools can't see
- Minimal ongoing management required once deployed and tuned
- Extends protection across connected SaaS applications automatically
Cautions
- According to some user reviews, only supports Microsoft 365 and Google Workspace environments
- No outbound email monitoring currently available
Mimecast Secure Email Gateway
Mimecast protects over 40,000 organizations with cloud-native email security. It’s built for enterprises running complex Microsoft 365 environments who need layered threat protection without wrestling with configuration complexity.
Threat Detection That Earns Its Keep
The AI-powered detection analyzes over a billion emails daily, and we found the results back up that scale. Spam and virus blocking rates are high, with especially low false positives on legitimate mail.
URL rewriting, attachment sandboxing, and impersonation protection work effectively out of the box. The Targeted Threat Protection suite handles Business Email Compromise and CEO fraud attempts that basic filters miss. M365 integration via API is genuinely seamless.
What Customers Are Saying
Customers consistently praise the protection, but the admin interface draws mixed reviews. Settings are deeply nested, and the UI can feel slow and unresponsive during policy tuning. New administrators face a learning curve.
URL protection runs aggressive by default. Legitimate links get blocked, and quarantine workflows sometimes delay important mail. You’ll likely spend time adjusting sensitivity settings to match your environment.
Does it Fit Your Team?
We think Mimecast makes sense for enterprise security teams who need full email protection and can invest time in initial configuration. The reporting and policy customization are strong once you learn the interface.
If you’re a smaller team wanting something simpler, or you need minimal tuning out of the box, this might be more platform than you need.
Strengths
- Low false positive rates mean legitimate emails reach inboxes without manual intervention
- Impersonation protection catches BEC and CEO fraud that traditional filters miss
- Fast deployment with minimal disruption to existing mail flow
- Full reporting gives security teams clear visibility into threats
Cautions
- Some users have noted that admin interface has nested settings that make advanced troubleshooting frustrating
- Based on customer reviews, URL protection defaults are aggressive and may block legitimate links
Barracuda Email Protection
Barracuda Email Protection bundles email gateway, inbox defense, and web security into one cloud platform built for SMBs and MSPs running Microsoft 365. It’s the “set it and forget it” option for teams that want solid protection without constant tuning.
Multi-Layered Detection That Actually Works
We found the layered approach genuinely effective. Static analysis catches known threats while sandboxing handles zero-days. The AI engines learn communication patterns to spot impersonation attempts, a growing problem that basic filters miss entirely.
The platform covers a lot of ground: URL and DNS filtering, encryption, archiving, and security awareness training all roll into one license. For M365 shops, that consolidation matters.
What Customers Are Saying
Users consistently praise reliability, “never had downtime” comes up repeatedly. Support gets high marks for responsiveness. The impersonation protection and incident response tools draw particular praise for catching threats that slip past other filters.
The complaints center on the interface. It’s functional but dated, and navigation feels sluggish in places. Some users flag false positives in quarantine management, legitimate emails getting blocked without clear explanations. The filtering logic lacks granular conditional rules, which frustrates admins who want more control.
Right Fit for the Right Team
We think this is a strong choice if you’re an SMB or MSP wanting full M365 protection without managing multiple point solutions. The all-in-one pricing makes budgeting predictable.
If you need enterprise-grade customization or have complex policy requirements, you’ll bump into limitations. But for teams prioritizing simplicity and coverage over fine-grained control, Barracuda delivers what it promises.
Strengths
- Reliable uptime with consistent threat blocking across spam, phishing, and malware
- Impersonation protection catches business email compromise attempts effectively
- Consolidates gateway, inbox, web security, archiving, and training in one platform
- Support team responds quickly and resolves issues without escalation hassles
- Once configured, requires minimal ongoing attention from your security team
Cautions
- Based on customer feedback, interface feels dated and sluggish, especially when navigating quarantine logs
- Some users mention that false positives occur and blocked message explanations lack actionable detail
Cisco Secure Email
Cisco’s cloud-based email gateway targets enterprises already invested in the Cisco ecosystem. It combines the Talos threat intelligence platform with deep integration across Cisco’s security stack, making it a natural fit for shops running Duo, SecureX, or Cisco endpoint tools.
Talos-Powered Protection That Actually Delivers
We found the real-time URL analysis catches threats that slip past simpler gateways. The Talos intelligence feed is genuinely massive, and you feel that coverage in day-to-day detection rates. Ransomware protection using Sophos engines adds another layer without requiring separate licensing.
Policy management surprised us. The admin dashboard consolidates controls for inbound, outbound, and internal email filtering in one place. Auto-remediation handles incidents without constant manual intervention.
What Customers Are Saying
Customers consistently praise the interface as intuitive once configured. Support gets high marks for responsiveness. The SecureX integration gives teams a unified threat view without jumping between consoles.
The learning curve is real though.
Right Fit for Cisco Shops
If you’re already running Cisco security tools, this slots in naturally. The cross-product telemetry sharing justifies the enterprise pricing. Smaller organizations or those without existing Cisco investments will find better value elsewhere.
We think this works best when you commit to the ecosystem. Standalone deployments lose the integration advantages that make it compelling. For Cisco-native environments needing enterprise-grade email protection, it delivers.
Strengths
- Talos threat intelligence provides one of the largest detection databases available
- SecureX integration creates unified visibility across Cisco security tools
- Auto-remediation reduces manual incident response workload significantly
- Intuitive admin interface once initial configuration is complete
Cautions
- Some users report that feature density means valuable capabilities often go undiscovered
- Some customer reviews note that documentation lacks clarity for complex configuration scenarios
Libraesva Email Security
Libraesva delivers gateway and API-level email protection for Microsoft 365, Exchange, and Google Workspace. It’s built for organizations that want deep configurability without enterprise pricing.
Layered Protection That Actually Catches Things
The solution combines SPF, DKIM, and DMARC authentication with deep file inspection and document sanitization. We found the threat analysis portal genuinely useful for understanding attack patterns rather than just blocking them.
One-click link protection and automated threat remediation handle the cleanup work. The system pulls malicious emails post-delivery, which matters when threats slip through initial scanning.
What Customers Are Saying
Users consistently praise the support team as exceptional. Setup is straightforward, and the integration with Google Workspace and M365 works without drama. End users can customize their own protection profiles, which reduces admin burden.
The admin interface needs work though.
Worth a Look if You’re Mid-Market
We think Libraesva fits mid-sized organizations and education clients particularly well. You get enterprise-grade protection without enterprise complexity or cost. The mobile app adds flexibility for remote management.
If brand recognition matters to your procurement team, you’ll need to make the case. But the technical capabilities stand up against bigger names. For teams that value configurability and responsive support over market presence, this deserves serious consideration.
Strengths
- Threat analysis portal provides clear visibility into attack patterns and email security posture
- Support team is highly responsive and technically capable
- Granular configuration options let you tailor protection to specific organizational needs
- Deployment is quick across both cloud and on-premises environments
- Mobile app enables effective remote management and monitoring
Cautions
- Some users have reported that admin interface lacks polish and some settings aren't intuitive
- According to customer feedback, documentation doesn't always reflect current product capabilities
Microsoft Defender for Office 365
Microsoft’s native email security for M365 environments. If you’re already running Microsoft 365, this slots in without the integration headaches you’d face with third-party gateways.
Native Protection That Actually Works
We found the AI-driven detection performs well against phishing, BEC, and malicious attachments. Safe Links checks URLs in real time, which catches threats that slip past static filters. The protection extends beyond email into SharePoint, OneDrive, and Teams automatically.
Setup is straightforward for M365 shops. Best practice configuration reporting helps you identify gaps without hiring a consultant. The dashboard gives you decent visibility into what’s being blocked and why.
What Customers Are Saying
Customers consistently praise the ease of deployment and management. The threat analysis reports help teams understand what’s hitting their environment. Real-time detection catches most of what you’d expect it to catch.
But there are frustrations.
Right Fit for Your Environment
Plan 1 at $2/user/month covers the basics. Plan 2 at $5/user/month adds investigation and response tools. If you’re on E5, you already have this.
We think this works well for SMBs and enterprises standardized on Microsoft. The native integration is hard to beat. If you need granular policy control or face sophisticated, targeted attacks, you might want a dedicated third-party solution alongside it. But for most M365 environments, this delivers solid protection without adding complexity.
Strengths
- Deploys instantly across SharePoint, OneDrive, and Teams with zero extra configuration
- Real-time URL scanning catches threats that static filters miss
- Best practice reports identify security gaps in your current setup
- Competitive pricing, especially if you're already on E5 licensing
Cautions
- Some users have noted that false positives can quarantine legitimate emails while some phishing gets through
- According to customer feedback, pre-built policies lack customization options for specific organizational needs
Other Email Security Services
We've looked at almost 50 email security solutions to create this list. Here's some other vendors we highly rated, with strong solutions for you to consider.
Email security solution with spam filtering and threat intelligence for MSPs.
An ICES tool that protects both inbound and outbound emails against phishing, BEC, and account takeover.
A cloud-based platform protecting emails from phishing with API-first security and Zero Trust integration.
An AI-driven platform securing email with real-time detection and autonomous response capabilities. Focused on Enterprise.
An AI-driven platform protecting emails with encryption, real-time detection, and adaptive controls. Now part of KnowBe4.
An integrated email security platform with real-time threat intelligence and advanced filtering capabilities.
A cloud-native platform with AI-driven detection, user training, and automated remediation.
A cloud-based tool protecting inbound and outbound emails from spam, malware, and phishing. Designed for MSPs.
A zero-trust platform securing inbound and outbound emails against phishing, malware, and spam.
An AI-powered platform with real-time scanning and managed incident response.
An AI-powered cloud platform securing emails, mobile, and browser apps against phishing.
Sublime Defend is a programmable cloud security platform that hunts for email threats and auto-triages end user reports.
Broadcom's enterprise secure email gateway, designed to secure cloud-based and on-premises email systems.
A cloud-native solution safeguarding inbound and outbound emails against phishing, malware, and spam.
Email Security Pricing Comparison Table
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Tools / Platforms
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Price
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Link
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|---|---|---|
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TitanHQ Email Security
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From $1.95 / User / Month
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IRONSCALES
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Free plan available
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Proofpoint Essentials
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From $1.65 / User / Month
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|
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Material Security
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From $3.00 / User / Month
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What To Look For Checklist
Email security solutions vary significantly in what they protect against and how they integrate into your environment. Use these criteria to evaluate candidates for your environment.
Phishing and BEC Detection
The baseline defense against modern attacks. Look for solutions that catch not just signature-based phishing, but also behavioral anomalies, impersonation attempts, and executive targeting. Traditional gateways block obvious threats; modern platforms learn from user behavior to catch sophisticated social engineering. Test how each candidate catches phishing variants and business email compromise attempts that bypass standard filters.
Integration With Your Email Platform
Solutions built for Microsoft 365 or Google Workspace deploy differently than traditional SEGs. API-level integrations avoid MX record changes but require different configuration. Gateway deployments filter all mail but add processing latency. Match the deployment model to your infrastructure and team capacity. If you’re running M365, verify the solution actually understands your cloud environment rather than treating it as an afterthought.
Data Loss Prevention and Archiving
Email carries sensitive data out of your organization constantly. Look for solutions that identify regulated data patterns, block unauthorized exfiltration, and maintain searchable archives for discovery. Advanced platforms scan file content, not just headers. If compliance matters to your industry, verify the solution handles your specific requirements, healthcare, financial, or legal sectors have different DLP rules.
URL and Attachment Security
Malware delivery through email attachments and malicious links remains constant. Effective solutions sandbox attachments, rewrite URLs to track threats post-delivery, and perform real-time analysis. The best platforms catch zero-day attacks and delayed threats that activate after delivery. Verify the solution can handle your file types and doesn’t create false positives that block legitimate attachments.
Operational Overhead
How much of your time does the solution consume after deployment? Gateway solutions require tuning security policies. API-based solutions often work with less configuration but may hide important settings. Cloud-native platforms usually require less maintenance. Understand your team’s appetite for ongoing policy management versus hands-off platforms that work out of the box.
Reporting and Investigation
When threats appear, can you investigate what happened? Look for solutions with deep threat analytics, clear quarantine interfaces, and historical email search. The best platforms give you visibility into detection signals and let you drill into why a specific email was flagged. Poor reporting tools turn security incidents into detective work.
Scalability and Performance
Will the solution handle your current email volume and growth? Look for solutions tested at your organization’s scale, with clear pricing models and no surprises at higher volumes. Cloud solutions should handle burst traffic without degrading performance. If you’re managing multiple organizations or departments, verify the solution supports multi-tenancy cleanly.
How We Compared The Best Email Security Solutions
We evaluated email security solutions across real-world deployment scenarios, threat detection accuracy, and operational patterns observed by security teams worldwide. Each solution was tested for phishing, business email compromise and malware delivery, plus data exfiltration patterns. We reviewed detection logs, false positive rates, and integration complexity. We also analyzed customer feedback from deployed implementations to understand where vendor claims diverged from operational reality.
Our testing approach focuses on independence. We review vendor documentation, but our conclusions rest on customer feedback and observed behavior in real environments. We map the vendor market to understand competitive positioning and where products excel or struggle. Full testing methodology available at https://expertinsights.com/how-we-test-review-products .
The Bottom Line
Your email security decision depends on three factors: your email platform, your threat priorities, and your team’s operational capacity. SMBs and MSPs managing cost-conscious deployments will find TitanHQ efficient. Organizations running Microsoft 365 or Google Workspace benefit from native solutions like Abnormal AI, Material Security, or Microsoft Defender for Office 365, which avoid the complexity of legacy gateway deployments. Enterprises managing large threat surfaces should evaluate Proofpoint Essentials or Mimecast for their thorough intelligence and scaling capabilities. If phishing remediation and dwell time are your primary pain points, IRONSCALES complements your existing email security effectively.
The wrong choice costs you in false positives that frustrate users, missed detections that create breach risk, or operational overhead that stretches your team too thin. The right choice stays invisible, catches real threats, and lets your team focus on more complex security work. Start with your infrastructure constraints, match that to the products that fit your environment, then evaluate detection accuracy and integration depth.
FAQs
Everything You Need To Know About Email Security (FAQs)
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Secure Email Gateway (SEG): A SEG filters incoming and outgoing emails to block spam, phishing, and malware before they reach the recipient’s inbox. It typically works by routing all email traffic through a centralized gateway, where it applies policies, scans for threats, and quarantines suspicious messages.
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API-Based Email Security: API-based tools (also called “integrated cloud email security” or “ICES” tools) integrate directly with cloud email platforms like Microsoft 365 or Google Workspace to detect and remediate threats inside users’ mailboxes. These tools continuously monitor email activity using APIs, which allows them to analyze and remove threats post-delivery without rerouting emails. The best modern API-based/ICES tools use machine learning models to analyze email content, metadata, and user behavior to detect sophisticated phishing attacks, BEC (Business Email Compromise), and zero-day threats.
- Mailflow Redirection (MX Record Modification): This method involves redirecting email traffic to a security service before delivering it to the final mail server. It works by modifying the domain’s MX (Mail Exchange) records to route emails through an external filtering service that scans for threats and then forwards safe emails to users.
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Email Authentication Protocols (SPF, DKIM, DMARC): These protocols prevent email spoofing and phishing by verifying sender identity and email integrity. SPF specifies authorized mail servers, DKIM signs messages with cryptographic signatures, and DMARC enforces policies based on SPF and DKIM results.
- Email Encryption: Email encryption tools protect sensitive information by encoding email content so that only authorized recipients can read it. These tools typically use encryption standards like TLS or PGP, either encrypting emails in transit or requiring recipients to authenticate via a secure portal.
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Email Data Loss Prevention (DLP): DLP solutions go a step beyond email encryption solutions. They prevent sensitive data from being sent outside an organization by monitoring and controlling email content. They apply predefined policies to scan for keywords, patterns, or attachments that may contain confidential information, blocking or encrypting emails as needed.
- Security Awareness Training And Phishing Simulations: These tools educate users on recognizing phishing attempts and other email-based threats through simulated attacks and training modules. They operate by sending test phishing emails to employees and tracking their responses to measure awareness and improve security posture.
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Email Archiving And Backup: Archiving solutions securely store emails for compliance, legal, and recovery purposes, ensuring organizations can retrieve old messages when needed. They work by automatically capturing and storing copies of emails in a secure, searchable repository, often with retention policies and audit capabilities.
Email continues to be the top threat vector for cyber criminals looking to access your organization’s data. 81% of organizations around the world have seen an increase in phishing since 2020, and in 2021 almost 40% of data breaches involved a phishing attack.
Originally, spam was the biggest nuisance that companies faced when it came to unwanted content in their users’ inboxes, ranging from the farcical (far-off Royals promising riches) to the malicious (adult and harmful content sent to mailboxes). Spam was a major headache for IT admins in the early days of the internet and continues to be a problem even now, with estimates suggesting that 49% of all emails are spam.
SEGs can deal with spam content very effectively – it’s typically sent using new or low-reputation domains, which can be quickly blocked by the email filter. But modern email threats are much more targeted and advanced. Spear phishing is one of the most common causes of data breaches today. In a spear phishing attack, a threat actor attempts to trick users into clicking harmful web links, making fraudulent payments, or sharing their login credentials. Advanced malware and ransomware are also commonly spread via phishing messages or via compromised email accounts.
Modern email security tools, such as SEGs and ICES solutions, protect against these threats by combining a range of techniques to filter out harmful content, including attachment sandboxing, URL filtering, domain reputation assessment, and machine learning.
Before cloud email hosting, the most common form of email security was the “secure email gateway (SEG)”, a physical appliance that would sit in front of the email network and monitor incoming and outbound email traffic to remove spam and malware. Today, email security services are more commonly cloud-based, with organizations redirecting their mail exchange (MX records) to point their email toward a cloud-based SEG.
Modern SEGs use a mixture of email content scanning, domain reputation, URL scanning, and attachment sandboxing to make a deterministic assessment of an incoming email message. If the message is deemed malicious, it is blocked, quarantined, or deleted; if it is deemed safe, it is delivered.
These tools work using a variety of techniques including greylisting, real-time blacklists (RBL’s), constantly updated spam definitions, pre-defined DLP rules, anti-malware, and sandboxing engines to detect and remediate malicious messages.
Here are the top features you should look for when comparing SEGs:
- Spam filtering – The solution should block unwanted and unsolicited emails.
- Phishing protection – The solutions should detect and prevent phishing attempts.
- Malware and virus scanning – The solution should scan attachments and links for harmful content.
- Advanced threat protection (ATP) – The solution should use AI and ML to detect emerging and evolving threats. While this is most common amongst ICES tools, the best SEGs (including those featured on this Shortlist) also offer ATP.
- Data Loss Prevention (DLP) – Some solutions offer data loss prevention capabilities, such as encryption, to prevent users from accidentally or intentionally leaking sensitive information.
- Domain-based message authentication – The solution should use DMARC, DKIM, and SPF to prevent email spoofing.
- Attachment sandboxing – The solution should open attachments in a safe environment to check for malware and viruses.
- URL protection – The solution should scan and rewrite links to prevent malicious redirects.
- Content filtering – You should be able to configure policies that define how the solution blocks or flags emails. For example, you may want to block all emails from certain domains, or allow emails from known senders that the solution may not otherwise recognize.
- Quarantine and reporting – The solution should quarantine suspicious content and provide both security teams and end users with detailed reports on why each email was blocked.
In the era of cloud-based email platforms, a new category of SaaS email security services has emerged. These services, named “integrated cloud email security” (ICES) solutions by Gartner, address SEG gaps by scanning the inbox environment directly. This means they can remove significant threats directly from users’ inboxes after they’ve been delivered, and they can also ensure your users’ accounts aren’t being used to send malicious or harmful content.
ICES solutions typically use large language models and machine learning to scan internal email conversations and identify sophisticated email threats such as spear-phishing, and indicators that an account has been compromised and is sending out malicious messages. When the ICES tool finds something suspicious, it can automatically remove that content from users’ inboxes, add a warning banner to it, and/or alert your security team to any compromised accounts.
For the most effective, enhanced protection against all types of email threats, we recommend that you implement multi-layered email protection, pairing a gateway with some form of cloud-native, inbox-based solution.
Here are some other guides and shortlists we have put together to help you learn more about email security:
- The Top 10 Email Encryption Platforms
- The Top 11 Email Security Solutions For Office 365
- The Top 9 DMARC Solutions For Business
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Email security solutions, including Secure Email Gateways (SEGs) and Integrated Cloud Email Security (ICES), provide critical protection against a wide range of cyber threats. They safeguard organizations from phishing, malware, spam, and advanced attacks like Business Email Compromise (BEC) by filtering malicious content in real-time. These tools help prevent data breaches, protecting sensitive information and maintaining customer trust.
Beyond threat prevention, email security solutions ensure compliance with regulations such as GDPR, HIPAA, and CCPA, reducing the risk of costly penalties. They also enhance productivity by minimizing spam and false positives, allowing employees to focus on legitimate communications. With features like AI-driven threat detection and seamless integration with platforms like Microsoft 365, these solutions offer robust, scalable defense tailored to modern business needs.
Many solutions provide detailed analytics and reporting, empowering IT teams to monitor threats and respond proactively. By reducing the likelihood of successful cyberattacks, email security tools save organizations from financial losses and reputational damage, making them essential for secure digital communication in 2026.
Pricing for email security solutions varies based on factors like the number of users, deployment type (cloud or on-premises), and feature set. Most providers offer subscription-based models, typically charged per user per month or annually, with discounts often available for longer commitments. SEGs may involve setup costs, especially for on-premises deployments requiring MX record changes, while ICES solutions, being cloud-native, often have lower initial costs.
Basic plans usually include core features like spam filtering and malware protection, while premium tiers add advanced capabilities such as AI-based threat detection, email encryption, and compliance tools. Some vendors offer tiered pricing, allowing businesses to scale as needed, while others provide custom quotes for enterprises with complex requirements. Free trials or demos are common, enabling organizations to test solutions before committing.
Pricing transparency can differ, with some providers publishing clear rate cards online and others requiring direct inquiries. Businesses should evaluate total costs, including integration and support, to ensure alignment with their budget and security goals for 2026.
Pinpointing the cheapest and most expensive email security solutions depends on specific features and organizational needs, as pricing isn’t always publicly disclosed. Based on market trends for 2026, plans can start as low as $1–$3 per user per month, offering basic spam filtering and phishing protection ideal for small businesses. These tools balance cost and functionality but may lack advanced enterprise-grade features.
On the higher end, enterprise-focused solutions like Proofpoint Email Protection and Mimecast Email Security typically command premium prices, often ranging from $5–$15 per user per month or more, depending on customization. These platforms provide comprehensive features like advanced threat intelligence, extensive archiving, and seamless integration with Microsoft 365, justifying their cost for large organizations with complex security needs.
Pricing can fluctuate based on user count and add-ons, so businesses should request quotes to compare options. Testing via free trials can also clarify which solutions deliver the best value for your specific requirements in 2026.
Free email security tools are limited in 2026, as robust protection often requires paid subscriptions to address sophisticated threats. However, some providers offer free tiers or tools with basic functionality suitable for individuals or very small businesses. For example, Zoho Mail includes a free plan with basic email security features like spam filtering, though it’s capped at a low user limit and lacks advanced threat detection. Similarly, tools like Clean Email provide free privacy monitoring to detect data breaches, but they focus on inbox management rather than comprehensive security.
Open-source options, such as SpamAssassin, offer free spam filtering for tech-savvy users comfortable with manual setup and maintenance. However, these lack the AI-driven capabilities and support of commercial solutions, making them less practical for most organizations. Many paid solutions, like Sophos or Trustifi, offer 30-day free trials, allowing businesses to test full-featured SEGs or ICES platforms without upfront costs.
For robust protection against phishing, malware, and BEC, free tools often fall short, and investing in a paid solution is recommended for reliable security. Always evaluate trial periods to explore premium features before deciding.
Written By
Joel is the Director of Content and a co-founder at Expert Insights; a rapidly growing media company focussed on covering cybersecurity solutions.
He’s an experienced journalist and editor with 8 years’ experience covering the cybersecurity space. He’s reviewed hundreds of cybersecurity solutions, interviewed hundreds of industry experts and produced dozens of industry reports read by thousands of CISOs and security professionals in topics like IAM, MFA, zero trust, email security, DevSecOps and more.
He also hosts the Expert Insights Podcast and co-writes the weekly newsletter, Decrypted. Joel is driven to share his team’s expertise with cybersecurity leaders to help them create more secure business foundations.
Technical Review
Craig MacAlpine is CEO and Founder of Expert Insights. Before founding Expert Insights in August 2018, Craig spent 10 years as CEO of EPA Cloud, an email security provider that rebranded as VIPRE Email Security following its acquisition by Ziff Davies, formerly J2Global (NASQAQ: ZD) in 2013.
Craig is a passionate security innovator with over 20 years of experience helping organizations to stay secure with cutting-edge information security and cybersecurity solutions.
Using his extensive experience in the email security industry, he founded Expert Insights with the singular goal of helping IT professionals and CISOs to cut through the noise and find the right cybersecurity solutions they need to protect their organizations.