Sophos Central E-Mail - S/MIME signed emails are getting invalid

Question

Hey Folks, 
 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. 
 Regards 
 Peter

Tom Foucha · Answer

I'm having the team scope it out and give me an estimate of what it will take to implement. I will let you know. 
 On your question - " i still dont understand, why some signed mails don't get the smart banners and signature is still valid, and others are getting invalid" previously we didn't banner plain text formatted messages. We enhanced the product to add information banners to plain text messages as well.

Tom Foucha · Answer

Apologies, have been out on travel and other events. Yes, we deployed the fix recently. I always suggest keeping an eye on this page for updates https://docs.sophos.com/releasenotes/index.html

Tom Foucha · Answer

Peter Geiger We are in the process of deploying the fix for this issue this week. It has passed validation in our QA environments and should be completed by Thursday globally.

Sophos Central E-Mail - S/MIME signed emails are getting invalid

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