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Email Protection corrupts incoming SMIME Mails

Hello,

we are using Sophos UTM 9.1 as an virtual Appliance.

I have the following scenario:

Incoming mails->NoSpamProxy->UTM->Exchange2010

In this scenario when a user gets an smime encrypted Email it is shown in Outlook (2010) as an normal (Text)Email with attachment, but the attachment is invisible.

When i change the routing, so the NoSpamProxy delivers directly to the Exchange, the mails are shown properly and the attachment is visible.

Also when i configure an exception for the sender address under EmailProtection->SMTP->Exceptions and set to skip "footer additions" checks the incoming mails will be fine.

is there something i am configuring wrong?


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