3.16.1

Release dateVersion
17th December 20253.16.1

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

Email Protection & Policy Enforcement

  • Fixed an issue where policies were not correctly applied to group recipients, ensuring the intended policies are enforced consistently.
  • Improved OTP validation to support secondary domains and email aliases.
  • Resolved issues with certain attachment types incorrectly failing analysis.

Reporting & Dashboard

  • Fixed discrepancies between Dashboard metrics and report data for prevented threats and event counts.
  • Improved accuracy of Dashboard event counters for released and quarantined messages.
  • Updated “Top Blocked Senders” logic to use the sender’s From: address across Dashboards and Reports.
  • Improved report filtering and field availability in Quarantine Reports.
  • Enhanced date handling in Quarantine Reports.

Search & Event Visibility

  • Improved email search reliability when From: header information differs from the SMTP envelope sender.
  • Improved audit trail completeness for message rescans and related events.

SIEM / SOAR Enhancements

  • Improved SIEM/SOAR configuration experience with clearer guidance and safer handling of sensitive fields.

  • Expanded SIEM/SOAR event coverage to include:

    • Quarantined and blocked emails
    • Login and logout events (successful and failed)

  • Added configurable filtering to control which events are sent to SIEM/SOAR platforms.

Operational & Platform Improvements

  • General performance, reliability, and maintainability improvements across the platform.
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Version 3.16
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3.16.1Improvements & FixesEmail Protection & Policy EnforcementReporting & DashboardSearch & Event VisibilitySIEM / SOAR EnhancementsOperational & Platform Improvements