Best Mimecast alternatives in 2026
Looking for an alternative to Mimecast? Whether you've outgrown it, find the pricing steep, or just want to weigh your options, these are the strongest email & data security alternatives in 2026 — ranked on pricing, features, and who each one fits best. Mimecast itself starts at custom, so we've flagged where each option is cheaper, simpler, or more specialized.
- 1Abnormal SecurityBest for: enterprise
AI-native email security against BEC A popular email security alternative to Mimecast — custom. Particularly strong for enterprise.
- 2IRONSCALESBest for: smb
If Mimecast feels like overkill or over-budget, IRONSCALES is a leaner option. AI-driven phishing protection and response Pricing: custom.
- 3Material SecurityBest for: enterprise
Material Security goes head-to-head with Mimecast on features. Email security and data protection for cloud mailboxes Best suited to enterprise. Custom.
- 4ProofpointBest for: enterprise
A well-rated email security pick. Email security and human-centric protection Proofpoint starts at custom, making it a credible Mimecast replacement.
- 6Tenable NessusBest for: smb
If Mimecast feels like overkill or over-budget, Tenable Nessus is a leaner option. Industry-standard vulnerability scanner Pricing: from $4599/yr.
- 8Rapid7 InsightIDRBest for: smb
A well-rated security privacy pick. Cloud SIEM and XDR for lean teams Rapid7 InsightIDR starts at custom, making it a credible Mimecast replacement.
Still considering Mimecast itself? Read our Mimecast review →
Frequently asked questions
What is the best Mimecast alternative?
Abnormal Security is our top-rated Mimecast alternative for 2026. AI-native email security against BEC Custom.
Is there a free Mimecast alternative?
Most alternatives are paid, but Tenable Nessus is the most affordable on this list at from $4599/yr.
Why switch from Mimecast?
Common reasons are price, a simpler feature set, better fit for a specific use case, or platform support. Each tool above notes where it has an edge over Mimecast.