Mimecast review

Security bundled with archiving and outage continuity.

Verdict

Mimecast ranks third because it bundles gateway security with archiving and mail continuity, so a company keeps sending and receiving even when Microsoft 365 has an outage.

What customers praise

Its continuity service delivers mail during a provider outage, a capability most pure-play detection tools do not offer.

What customers criticise

Detection is strong but trails the behavioral leaders on novel BEC, and the bundle can cost more than teams that only want filtering.

Best for

Organizations that want email security, archiving, and continuity so mail keeps flowing during an outage.

At a glance

• Integrations: Microsoft 365, Google Workspace, Okta, CrowdStrike, ServiceNow
• Compliance: SOC 2 Type II, ISO 27001, GDPR
• Regions served: North America, EMEA, APAC
• Typical onboarding: 7 days

Red flags

Public risk signals as of July 2026: none. No material public risk signals as of 2026-07-04. See the full red-flag report.

Alternatives

See alternatives to Mimecast, or compare against the next-ranked entry: Mimecast vs Microsoft Defender for Office 365.

Source: Top 11 Top 11 Email Security Software, verified July 4, 2026 — no paid placement.