Top 10 Mimecast Email Security Alternatives in 2026

Updated May 2026 · Email & Phishing Security

Why Look for Alternatives?

Mimecast Email Security is a popular choice in the Email & Phishing Security space, but it is not the only option worth evaluating. Teams may seek alternatives due to pricing concerns, feature gaps, deployment constraints, or a need for open-source flexibility. The 10 Email & Phishing Security tools below — ranked by community rating — cover the realistic replacement and complement scenarios you should consider before committing to Mimecast Email Security for the long term.

Comparison Table

Tool Rating Pricing Open Source Best For
1. Abnormal ICES Platform 4.6/5 Enterprise N enterprise teams needing Email & Phishing Security
2. Proofpoint Email Protection 4.6/5 Enterprise N enterprise teams needing Email & Phishing Security
3. Check Point Harmony Email 4.5/5 Paid N enterprise teams needing Email & Phishing Security
4. Proofpoint 4.5/5 Paid N enterprise teams needing Email & Phishing Security
5. Area 1 Security 4.4/5 Paid N enterprise teams needing Email & Phishing Security
6. Avanan Cloud Email 4.4/5 Paid N enterprise teams needing Email & Phishing Security
7. Darktrace EMAIL 4.4/5 Paid N enterprise teams needing Email & Phishing Security
8. IRONSCALES 4.4/5 Paid N enterprise teams needing Email & Phishing Security
9. Sublime Security Email 4.4/5 Freemium Y budget-conscious teams needing Email & Phishing Security
10. Agari Phishing Defense 4.3/5 Enterprise N enterprise teams needing Email & Phishing Security

Top 10 Mimecast Email Security Alternatives

1. Abnormal ICES Platform

4.6/5

Enterprise

Integrated cloud email security replacing legacy SEGs with behavioral AI threat detection.

4. Proofpoint

4.5/5

Paid

AI-powered email security and compliance platform protecting against phishing, BEC, malware, and data loss across email and cloud channels.

5. Area 1 Security

4.4/5

Paid

Preemptive email security acquired by Cloudflare using AI to stop phishing before delivery.

6. Avanan Cloud Email

4.4/5

Paid

API-based email security by Check Point catching phishing missed by Microsoft 365 and Google.

7. Darktrace EMAIL

4.4/5

Paid

Self-learning AI email protection without rules or signatures.

8. IRONSCALES

4.4/5

Paid

Self-learning email security with AI phishing detection and automated remediation.

9. Sublime Security Email

4.4/5

Freemium · Open Source

Open-core email security platform with customizable detection rules and AI-assisted triage.

10. Agari Phishing Defense

4.3/5

Enterprise

AI-powered email identity protection using behavioral analytics to stop phishing and BEC.

Frequently Asked Questions

What is the best free alternative to Mimecast Email Security?

Sublime Security Email is the strongest free or open-source alternative to Mimecast Email Security in the Email & Phishing Security category, with a community rating of 4.4/5.

Is Abnormal ICES Platform better than Mimecast Email Security?

Abnormal ICES Platform carries a community rating of 4.6/5 vs 4.4/5 for Mimecast Email Security. "Better" depends on your specific use case — pricing, deployment model, integrations, and support requirements all factor in. Compare both tools in detail before deciding.

How many Mimecast Email Security alternatives exist?

There are 23 other tools in the Email & Phishing Security category in our directory. We feature the top 10 above, ranked by editorial rating. Browse all alternatives →