Microsoft introduced an Outlook DMARC email rejection rule, bouncing messages lacking DMARC records with the 550 5.7.1 authentication error. Related Posts: Apple Tightens macOS Full Disk Access in macOS 27.3 Google Firebase Studio Shutdown Set for March 2027 AMD Driver SSD Writes Spark Excessive Drive Wear Concerns The post Outlook DMARC Email Rejection Policy Bounces Unsigned Messages appeared first on Daily CyberSecurity.

Microsoft will block MSIX and MSIXBundle attachments in Outlook and Exchange Online starting November 2026 to prevent malware distribution. Related Posts: RD Web Access Breaks as Chrome Drops XSLT Support Run Googlebook OS on MacBook via QEMU Virtualization Google AI Edge Foresight: A Free Offline Mac Tool The post Microsoft Blocks MSIX Attachments in Outlook appeared first on Daily CyberSecurity.