Cost-sensitive SMBs (Defender for Business or Microsoft 365 Business Premium cheaper), on-prem Exchange shops (unsupported), or buyers wanting a single replacement gateway rather than an additive overlay.
Enterprises (1,000-100,000+ employees) on Microsoft 365 or Google Workspace adding an AI-behavioral overlay on top of Defender for O365 or a legacy SEG to catch BEC, ATO, and vendor email compromise.
Why we say this
Editorial pulled these weaknesses from Abnormal Security’s product card in our Top 10 Email Security Software for 2026:
- ! Premium overlay pricing ($5-$12/mailbox/month typical) on top of your existing Defender or SEG spend
- ! Pricing opaque; channel-only disclosure
- ! Does not replace inline SEG / Defender for most buyers, additive cost not substitutive
- ! Rapid pricing escalation reported at renewal (15-25%) for 2025-2026 cohorts
- ! Limited support for non-cloud mail (on-prem Exchange unsupported)
- ! Detection beyond email (Slack, Teams, Zoom) still maturing
If Abnormal Security is wrong for you, consider these instead
Same Email Security Software category, different best-fit buyer.
Best for
Any organization on Microsoft 365 E5 (essentially standard at zero marginal cost), or M365 E3 / Business Premium organizations adding Defender for O365 Plan 2 standalone.
See full profile →Best for
Mid-market and enterprise buyers (500-50,000 employees) wanting an integrated bundle of email security + continuity + archive + awareness training under a single vendor, particularly in the UK and EU.
See full profile →Best for
Large regulated enterprises (financial services, healthcare, federal) wanting a mature SEG with the broadest archive / DLP / compliance bundle and willing to pay premium pricing under PE ownership.
See full profile →Related editorial
Last updated 2026-05-09. Editorial verdict based on the published Top 10 Email Security Software for 2026 ranking. Disagree? Tell us.