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

Peter Riederer

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



Edited tags
[edited by: Raphael Alganes at 2:28 AM (GMT -7) on 30 Jun 2023]
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  • 0 in reply to Simon Brunner

    not really, turning circles with support for almost 4 weeks now.

    do you use smartbanners? we have the problem, some signed emails are getting applied with smarbanner, hence signature invalid, some emails are not and the signature is valid. (same sender) other senders, do always have an invalid signature e.g. dhl shipping notifications. we also tried to disable the smartbanner feature, but this doesnt change everything.

    imho, there are problems with the recognition of signed emails in sophos backend

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