Ondrej Žilinec – IT Blog

Problem

Today I wanted to have day off, but customers with Exchange environments (2013/2016 and 2019) started to have a problem with e-mails delivery. They have started to receive following error in event viewer:

This event started to show couple minutes after 1.1.2022.

Messages stucked at queue and with error “Message deferred by categorized agent”:

Solution

So Antimalware has problem with date “22010100009” and error says it’s “too long”. It looks like Microsoft programmers use to record date 32b numbers and now this value is over variable limits. I think there is will hotfix pretty soon. Until hotfix we need to solve a problem. I just disabled Antimalware engine running following powershell script:

& $env:ExchangeInstallPath\Scripts\Disable-AntimalwareScanning.ps1

and restart MSExchangeTransport service afterwards:

Restart-Service MSExchangeTransport

And that’s all folks 🙂