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Email Security Tools Compared

Email security tools protect against phishing, business email compromise (BEC), malicious attachments, and account takeover via SEGs or API-integrated platforms. Side-by-side comparison across 4 tools — descriptive only, no recommendations.

6 min read Data verified: May 2026 4 tools compared
Proofpoint
Email Security / SEG
Paid
$2-$5/user/mo (Essentials), $5-$15/user/mo (Enterprise tiers with TAP) large deployments $100K+/yr
Visit official site →
Abnormal Security
Email Security (Behavioral AI)
Paid
~$150-$200/user/yr typical enterprise pricing per practitioner reports custom quoting; ~$174/user/yr cited as common reference point
Visit official site →
Mimecast
Email Security / SEG
Paid
Estimated $5-$15/user/mo across Critical, Advanced, Premium tiers new email security plans introduced 2026 with custom pricing
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MailScanner
Email Security (Open Source)
Free / OSS
Free (GPL); paid commercial support contracts available through MailScanner… sponsors and integrators
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Comparing →
Proofpoint
Email Security / SEG
Abnormal Security
Email Security (Behavioral AI)
Mimecast
Email Security / SEG
MailScanner
Email Security (Open Source)
$ Pricing & plans
5 dimensions
Pricing model
Essentials tier: ~$2-$5/user/mo ($36-$60/user/yr)
Business, Advanced, Professional sub-tiers. Enterprise with TAP: ~$5-$15/user/mo depending on modules. Large enterprise bundles (Threat Protection + DLP + Insider Threat + Compliance) can exceed $100K/yr.
Custom enterprise pricing
Vendr/CostBench data references ~$174/user/yr as a common reference point; pricing scales with employee count and modules selected
Custom quote-based
estimated $5-$15/user/mo. UK G-Cloud framework data shows mid-tier pricing in similar ranges. Module additions (archiving +30-40%, training +$1.50/user, DLP +20-30%) stack above base tier. 500-user org might pay ~$3/user/mo while 100-user org pays $4+/user/mo at same modules.
MailScanner software is free under GPL.
Optional commercial support contracts and managed deployments via MailScanner sponsors and integrators (e.g., Baruwa Enterprise, MailWatch ecosystem). Most deployments run fully self-supported.
Pricing tier
Paid
Paid
Paid
Free / OSS
Free tier / trial
Trial only
Free trials available for Essentials plans via Proofpoint sales or authorized partners; enterprise PoC via direct sales
Trial only
No free tier; risk assessment scan via API integration available for evaluation; trial/PoC via direct sales
Trial only
No free plan; trials available upon request via Mimecast sales
Free tier
Software permanently free; no trial needed
Volume discounts
Tiered pricing with breaks at 100, 500, 1000+ users
multi-year commitments common; bundling additional modules increases discount leverage
Negotiated by employee count
multi-year commitments common; VIP protection module sometimes bundled into base contract for larger deals
Volume tiers with significant per-user variance
500+ user deployments commonly see better per-user pricing than 100-user deployments; multi-year commitments offer 10-20% savings on bundles
Not applicable for free software
Hidden costs
Targeted Attack Protection (TAP), DLP, Insider Threat Management, Archiving,…
Security Awareness Training, and Email Fraud Defense (DMARC) are typically priced as separate modules; professional services for setup
VIP Protection (executive monitoring), Supply Chain Fraud Detection (vendor…
email compromise), Advanced Threat Intelligence, AI Security Mailbox, and other add-on modules may carry incremental fees; professional services for custom workflow design
Renewal price increases (25%+ reported in some cases
multi-year terms reduce exposure), data export fees when migrating, premium support charges for SMBs, bundled training and other features charged even if unused
Linux mail server infrastructure, SpamAssassin rule maintenance, optional…
commercial AV engine subscriptions (F-Prot, Sophos), operational labor for tuning and false-positive triage, monitoring/reporting infrastructure
↗ Deployment & integrations
3 dimensions
Deployment
Cloud SEG — MX records point to Proofpoint, which scans inbound/outbound mail…
before delivery; supplemental API integration for some use cases
API-based integration with Microsoft 365 or Google Workspace via three-click connection
no MX record changes, no mail flow disruption
Cloud Secure Email Gateway
MX records redirect mail through Mimecast for scanning and policy enforcement before delivery to Microsoft 365 or Google Workspace; some hybrid/on-prem options for specific use cases
Self-hosted on Linux mail servers
integrates with Postfix, Sendmail, Exim, Qmail, Zmailer as a content scanner; commonly paired with SpamAssassin (spam), ClamAV (malware), and optionally F-Prot, Sophos, or other commercial AV engines
Typical deployment time
Days for Essentials deployments with mail flow cutover
weeks for enterprise with TAP, DLP, archiving, awareness training, and DMARC integration
Minutes for API integration
days to weeks for full tuning, vendor relationship baselining, and workflow integration
Days to weeks for SEG mail flow cutover
weeks to months for full deployments with archiving, continuity, training, and DLP integration
Hours for basic install on existing mail server
days to weeks for production tuning, rule customization, quarantine workflows, and reporting setup
Key integrations
Microsoft 365, Google Workspace, Splunk, Microsoft Sentinel, IBM QRadar,…
CrowdStrike, Okta, ServiceNow; integrates with Proofpoint Security Awareness Training, DLP, and Archiving products
Microsoft 365, Google Workspace
SIEM forwarding (Splunk, Microsoft Sentinel); CrowdStrike, Okta, Slack, ServiceNow; identity and SSO platforms
Microsoft 365, Google Workspace, Microsoft Sentinel, Splunk, CrowdStrike,…
ServiceNow, Okta, Active Directory; 30+ integrations for IAM/PAM, endpoint, SOAR, SIEM
Postfix, Sendmail, Exim, Qmail, Zmailer
SpamAssassin, ClamAV, F-Prot, Sophos, Avira, BitDefender, Kaspersky engines via integration; MailWatch web UI for monitoring; SIEM forwarding via syslog
📧 Email Security-specific evaluation
7 dimensions
Architecture / deployment
Cloud Secure Email Gateway
mail flow is redirected via MX records through Proofpoint before delivery to Microsoft 365 or Google Workspace; supplemental API integration for some products
API-native — connects to Microsoft 365 or Google Workspace via Graph API or equivalent
scans inbound, outbound, and internal email post-delivery for anomalies; quarantines or flags suspicious messages
Cloud Secure Email Gateway
mail routes through Mimecast via MX records before delivery; tightly integrated with Mimecast Cloud Archive and Continuity for unified email management
Content scanner that integrates into Linux mail server mail flow
Postfix/Sendmail/Exim receives mail, hands to MailScanner for scanning, which returns clean mail back to MTA for delivery; deployable as bastion mail gateway in front of internal mail servers
Threat detection approach
Multi-layer detection
signature-based filtering, URL rewriting and sandboxing (TAP), attachment sandboxing, anti-spam scoring, ML-based impostor and BEC detection, Emerging Threats threat intelligence
Behavioral AI analyzing tens of thousands of signals per organization
communication patterns, vendor relationships, language patterns, identity behavior, login signals; no reliance on signatures or static rules
AI-powered threat detection with URL and attachment protection, impersonation…
defense, multi-layer scanning; URL rewriting at click-time; integration with threat intelligence feeds
Multi-engine
SpamAssassin for spam scoring, ClamAV/commercial engines for malware, content filtering for attachments and URLs, custom rule sets via Perl-based ruleset language
BEC / impersonation defense
Targeted Attack Protection (TAP) and Email Fraud Defense
impostor email detection analyzing message headers, sender IP, language; visibility into phishing URLs and attachments
Core platform focus
vendor email compromise (VEC), executive impersonation, internal account compromise, lateral phishing all detected by behavioral baselining rather than reputation/signature alone
Impersonation Protect module analyzes header anomalies, sender patterns, and…
content for executive impersonation and BEC attempts
Basic header and content-based rules
no behavioral AI baseline like modern API-based platforms — organizations needing strong BEC detection typically pair with additional tooling or accept the rule-based detection level
URL & attachment defense
URL Defense rewrites and sandboxes URLs at click-time
Attachment Defense sandboxes attachments; integrates with Proofpoint Threat Response for automated remediation
URL and attachment analysis as part of behavioral detection
less emphasis on time-of-click URL rewriting (different architectural choice than traditional SEGs)
URL Protect rewrites links for time-of-click sandboxing
Attachment Protect scans attachments via static and dynamic analysis; integrates with Mimecast Threat Intelligence
URL blacklists, attachment filtering by file type/extension/MIME type,…
multi-engine attachment scanning via integrated AV engines
DMARC / authentication
Email Fraud Defense (separately licensed) is Proofpoint's DMARC enforcement and…
visibility product; supports SPF, DKIM, DMARC; reports on domain abuse
DMARC monitoring and visibility supported
not a dedicated DMARC enforcement vendor like specialized products in that space
Mimecast DMARC Analyzer (separately licensed) provides DMARC implementation and…
ongoing management; supports SPF, DKIM, DMARC reporting
DMARC/SPF/DKIM evaluation typically delegated to MTA (Postfix/Exim/Sendmail)…
which check authentication before MailScanner content scanning; OpenDMARC and OpenDKIM commonly paired
Email archiving / continuity
Proofpoint Enterprise Archive (separately licensed) provides cloud archiving…
and e-discovery; email continuity service available as add-on; supports legal hold and supervision
Not a core focus
Abnormal positions as an email security layer, not an archiving or continuity vendor; organizations typically pair with Microsoft 365 native archiving or a separate archiving product
Mimecast Cloud Archive is a core platform strength
tamper-proof email archiving with triplicate copies, legal hold, e-discovery, FINRA/SEC/FCA supervision; email continuity service included in base tiers
Not a core feature
typically paired with separate archiving solutions (Cyrus IMAP, Dovecot archiving, dedicated archive products) and mail server HA setups
Reporting & SOC integration
Threat Response Auto-Pull for SOC remediation of malicious emails post-delivery
PhishAlarm reporting button for users; SIEM forwarding via syslog and API; integration with Splunk, Sentinel, QRadar
AI Security Mailbox automates triage and remediation of user-reported phishing
SIEM forwarding via Splunk and Microsoft Sentinel; SOC workload reduction often cited as a key value driver; integrations with SOAR platforms
User reporting via Mimecast plugin
admin console for incident review; SIEM forwarding via syslog and API; SOAR integration; integration with SOC tooling (Splunk, Sentinel, QRadar)
MailWatch and Baruwa provide web UIs for quarantine review and reporting
syslog forwarding for SIEM ingestion; quarantine management via web interface
✓ Compliance & certifications
1 dimension
Compliance certifications
SOC 2 Type II, ISO 27001, ISO 27018, HIPAA-aligned, GDPR, FedRAMP Moderate…
(Government tier); supports compliance reporting for HIPAA, PCI DSS, FINRA, SOX
SOC 2 Type II, ISO 27001, GDPR
HIPAA-aligned configurations available
SOC 2 Type II, ISO 27001, HIPAA-aligned, GDPR
supports compliance for FINRA, SEC, FCA, SOX (especially via Mimecast Cloud Archive and Supervision modules)
Software has no specific certifications
users deploy in their own compliant environments. Organizations operating MailScanner-based gateways are responsible for their own compliance posture.
◧ Positioning
3 dimensions
Target deployment
Mid-market to enterprise wanting mature SEG with broad threat protection, DLP,…
and compliance portfolio
Organizations wanting modern API-based email security focused on BEC, vendor…
email compromise, and account takeover detection
Mid-market to enterprise wanting integrated email security + archiving +…
continuity + human risk management
Organizations running self-hosted mail servers, ISPs, MSPs, technical teams…
wanting full control of mail filtering without per-user licensing
Strengths cited
Long-established email security vendor with broad portfolio (TAP, DLP,…
encryption, archiving, security awareness training), strong threat intelligence (Emerging Threats Pro / ET Pro), modular product set covers most email security needs from one vendor
Behavioral AI builds employee and vendor relationship baselines
API integration deploys in minutes without mail flow disruption; strong BEC and vendor email compromise detection; complements existing Microsoft 365/Defender deployments; recognized Leader in Gartner Magic Quadrant for Email Security Platforms
Strong integrated platform combining email security, archiving, continuity, and…
human risk management; built-in email continuity is differentiating (included in base tiers vs add-on for many competitors); broad compliance and archiving capabilities; 42,000+ business customers
Free open source mail filter framework that bundles multiple scanning engines…
(SpamAssassin, ClamAV, F-Prot, etc.), highly customizable rule sets, widely deployed in self-hosted mail server environments, mature project with long operational track record, no per-user licensing
Where it fits less well
Modular licensing means each capability (TAP, archiving, DLP, awareness…
training) may be priced separately; setup involves MX record changes and mail flow redirection; initial configuration depth often benefits from professional services or experienced reseller
Designed as primary platform OR layered with existing email security
strategy choice matters for buyers; API approach requires granting access to email content; advanced modules (VIP protection, supply chain fraud, advanced threat intelligence) may carry incremental fees
Quote-based pricing varies 30-100% between similar organizations based on tier,…
modules, and term; renewal pricing increases are commonly reported and worth negotiating multi-year terms to mitigate; module additions stack as percentage increases above base tier
Requires Linux mail server administration expertise
setup and tuning depth means production deployments take meaningful operational investment; primarily a fit for self-hosted mail environments rather than Microsoft 365 / Google Workspace tenants (which use API-based or SEG products instead)
Head-to-head comparisons
3 pairs
Proofpoint vs Mimecast→ Proofpoint vs Abnormal Security→ Abnormal Security vs Mimecast→
Methodology Comparison data synthesized from publicly available vendor documentation, MITRE Engenuity ATT&CK Evaluations, AV-TEST results, Gartner Peer Insights, G2/Capterra/TrustRadius reviews, anonymized transaction data (Vendr, CostBench, CheckThat.ai), and publicly reported pricing as of May 2026. defend.network is independent and has no commercial relationship with the vendors compared.