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S/MIME Signatures invalid when e-mail has attachment

Hi,

I've done some searching on the forum, this problem ist discussed a few times but without any solution. So I give it a new try. 

On a Sophos UTM V 9.352-6 I want to sign/decrypt outgoing mails. I use a StartSSL Cert and all seems to be well configured.

If I send just a plain e-mail the UTM signs the outgoing mail, no problem occurs. On the recepient side everything look fine

If I send the same e-mail with an attachment, e.g. a word document or a picture, the remote end says that the signature is invalid as the content has been changed. This has been testet with thunderbird and outlook.

I already tested with Parameters  'inline, noconversion', !inline unicode conversion' and 'MIME Part': always the same problem.

I hope that there is a solution for that phenomenon or someone with a working configuration could help.

Cheers Gert

 



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