People.
There appears to a y2k22 bug in Exchange servers - and its fairly nasty. As of midnight UTC, the Filtering Service stopped passing emails, email goes in - and never gets delivered to the mailbox. Easiest thing to look for in the event logs: The FIP-FS Filtering Management Service was unable to acquire a scanner within the specified timeout. or The FIP-FS "Microsoft" Scan Engine failed to load. PID: 12348, Error Code: 0x80004005. Error Description: Can't convert "2201010001" to long. Office365 appears NOT affected at this stage. (as expected, with MS's current "move to our cloud" strategy) https://twitter.com/JRoosen/status/1477120097747677184 Quick fix for a 2016 system, open a Exchange Management Power Shell screen. cd $exscripts .\Disable-AntimalwareScanning.ps1 Restart-Service MSExchangeTRansport And anything waiting in the submission will get delivered in the next few mins.
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