Symptoms
Consider the following scenario:
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You’re running Microsoft Exchange Server 2019.
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Your instance of Exchange Server is compliant for Federal Information Processing Standards (FIPS).
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You have a transport rule set to “scan for executable content.”
In this scenario, when you try to send a PDF file through Exchange Server, the program stops responding, and the message isn’t delivered to users.
Resolution
To fix this issue, install Cumulative Update 12 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.