Exchange – Emails stuck in the queue (solved)

UPDATE Microsoft has published the solution to fix the issue; please check the source link at the end of this post

This is not a good start for Exchange administrators. If you are using Exchange on-premises, your emails may be stuck in the queue with the error

Message deferred by categorizer agent

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This is due to the antimalware engine which has trouble to validate the date after the start of the new year.

While Microsoft is working on a fix, the only option available is to disable the antimalware engine using the PowerShell script and restart the Exchange Transport Service

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

Restart-Service MSExchangeTransport

Source: https://techcommunity.microsoft.com/t5/exchange-team-blog/email-stuck-in-transport-queues/ba-p/3049447

2 thoughts on “Exchange – Emails stuck in the queue (solved)”

    1. You’re welcome
      Microsoft has published the solution to fix the problem while keeping the antimalware engine enabled; please check the source link at the end of the post

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