Email Security Gateway Complete Guide: Top Solutions Compared
Deep dive into email security gateways including Proofpoint, Mimecast, Abnormal Security, and more. Features, pricing, and effectiveness against BEC and phishing.
Email remains the #1 attack vector for cybercriminals. With 94% of malware delivered via email and the average BEC (Business Email Compromise) loss exceeding $125,000, a robust email security gateway is essential for every organization.
Market Leaders Comparison
| Feature | Proofpoint | Mimecast | Abnormal Security |
|---|---|---|---|
| Phishing Detection | Excellent (95%+) | Very Good (92%) | Excellent (99%) |
| BEC Protection | Advanced | Good | Best-in-class |
| DLP Capabilities | Comprehensive | Strong | Limited |
| Email Archiving | Included | Included | Not available |
| AI/ML Detection | Yes | Yes | Behavioral AI only |
| Gartner Rating | 4.5/5 | 4.4/5 | 4.6/5 |
| Starting Price | $3/user/mo | $2/user/mo | $4/user/mo |
Key Trends in Email Security
1. AI-Powered Detection: Behavioral AI detects anomalies in email patterns
2. API-Based Integration: Cloud-native solutions integrate via API (M365, Google Workspace)
3. Automated Incident Response: Auto-remediation of malicious emails
4. DMARC Enforcement: Domain authentication to prevent spoofing
5. CISO Dashboard: Executive reporting on email security posture
Best for Each Use Case
- Enterprise: Proofpoint — most comprehensive protection with DLP and archiving
- Cost-Conscious: Mimecast — good protection at lower cost
- BEC Protection: Abnormal Security — best-in-class for business email compromise
- Microsoft 365 Native: Microsoft Defender for Office 365 — included with E5
- Open Source: MailScanner + ClamAV — free but requires expertise
[Sources: Gartner Magic Quadrant for Email Security 2025, FBI IC3 Report 2025]
Cybersecurity Tool Hub Team
Security Analyst
All reviews and comparisons are based on verified data from G2, Capterra, TrustRadius, and other trusted sources.