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Signature block and digital signature doesnt work together

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Hello everyone, im having an issue and cant figure out the solution.

The thing is that signature block doesnt work together with digital signature in S/MIME format. The email is sent signed, but the receiver gets a warning telling that it is not secure, that the message could have been modified.

I already checked this: and this

Disabled PGP through the configuration editor, the signature block is on pure text with no HTML. Also, before sending im choosing pure text format, and that doesnt work either.

The only solution i found is to manually delete the generated signature block. Also, if the signature is a picture file it works just fine, but if it is a .txt we have the same problem.

Can somebody help me? im willing to share every configuration that you ask.

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