we are evaluating Sophos Central E-Mail and experiencing issues with incoming S/MIME signed e-Mails. The Signature is getting invalid, and our security appliance cannot validate the signature/certificate anymore. E-Mails not routet via E-Mail Central from same sender, dont have any issues.
We already created an exception in data control (forward incoming signed e-mails to new gateway) which always applies successfully, but there is still something happening or getting changed on the email.
Are there any issues known with signed e-mails? Or what else can we do?
Thx a lot in advance.
[edited by: Raphael Alganes at 2:28 AM (GMT -7) on 30 Jun 2023]