3.18

Release dateVersion
19th February 20263.18

MetaDefender™ Cloud Email Security is an advanced solution that bolsters Microsoft 365’s native email defenses with industry-leading threat prevention. It is purpose-built to detect and neutralize malware, zero-day exploits, and embedded file-based threats before they reach the inbox.

This solution is powered by OPSWAT’s Metascan™ Multiscanning, adding more AV (antivirus) engines, and Deep CDR™ (Content Disarm & Reconstruction) against file-based threats. With multi-layered, proactive protection, email security goes beyond signature-based detection with advanced technologies against evolving threats. Designed for seamless integration, the solution deploys rapidly without disrupting mail flow.

Improvements & Fixes

Allowlist

  • Introduced scope-based Email Sender Allowlist, allowing configurable security bypass levels.

Events

  • Added flags for:
    • Signed / Encrypted emails (sanitization skipped)
    • Emails delivered after correct password provided.

Integration wizard

  • Added Summary step during onboarding
  • Implemented consent polling and auto-resume onboarding (Microsoft Entra).

Mailflow & Processing

  • Improved ARC signing/sealing support.
  • Fixed processing latency calculation
  • Fixed suspicious files inside archives returning incorrect overall verdict
  • Fixed txt/html attachments not appearing in Attachments tab
  • Fixed empty plain text bodies causing “Failure to Analyze” verdict
  • Fixed failed-to-scan verdict incorrectly marked as “Skipped” instead of “Failure to Analyze”
  • Fixed allowlisted emails with Deep CDR disabled not detecting encrypted content
Type to search, ESC to discard
Type to search, ESC to discard
Type to search, ESC to discard
Next to read:
3.17
On This Page
3.18Improvements & FixesAllowlistEventsIntegration wizardMailflow & Processing