On 2 Jan 2017, at 16:25, Jan Vanvinkenroye wrote:

I am setting up S/MIME Mail encryption. I have acquired a certificate and have installed it in the keychain. In mail.app sending and receiving mail is possible. In Mailmailte
i get the error „Unknown format in import. Error code: -25257“.

What can be the next steps?

You can try enabling some debug code and launch MailMate from a Terminal window. It works like this:

        defaults write com.freron.MailMate MmDebugSecurity -bool YES
        /Applications/MailMate.app/Contents/MacOS/MailMate

Then try again and see if the output is helpful in any way.

--
Benny
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