HTML disclaimer breaks PGP encrypted emails

Tomass Pētersons 336 Reputation points


Our organization has a policy that adds a disclaimer to all emails received from outside the organization. Recently, one of our users reported that the PGP encrypted email message he received was corrupted.

The disclaimer appears to break PGP encrypted emails, despite the fact that the rule states that if the disclaimer can't be applied, attach the message to a new disclaimer message.

I can add an exception that would not add a disclaimer to encrypted emails, but our organization policy states that a disclaimer is mandatory, so maybe there's another solution?


Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. KyleXu-MSFT 26,211 Reputation points

    @Tomass Pētersons

    I guess this phenomenon is caused by transport rule modifying the encrypted message body.

    Do you try to only modify the message subject like below?

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