When digitally signing my emails using SHA1 / SHA256 / SHA512 the recipient gets a warning that the mail may have been altered with.

I might suspect is that the header set in SOGO or Evolution is altered in postfix.

Do anyone know how to fix this or to stop the alteration of the email in postfix?

How are you signing the mails exactly?

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Hi Ares, I am signing them using my email certificate in evolution email client?

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