I have created an outgoing policy to check the outgoing attachment. The logic is that:
1. If there are no attachment in the email, then deliver it, otherwise
2. if the attachment is in format of OUT_*.ZIP, then deliver it, otherwise deny it.
The problem is this. when sending an Encrypt and Signed email, it will trigger the rule 2 and block it even there are no attachment.
The question is that why Encrypt and Signed plain text email will detected as an attachment, how can I check that the outgoing email is Encrypt and Signed, and bypass it.
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