The version checking performed against the signature file is causing the malware engine to crash, resulting in messages being stuck in transport queues. This is not an issue with malware scanning or the malware engine, and it is not a security-related issue. The problem relates to a date check failure with the change of the new year and it not a failure of the AV engine itself. We have addressed the issue causing messages to be stuck in transport queues of on-premises Exchange Server 2016 and Exchange Server 2019.
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