https://bugs.kde.org/show_bug.cgi?id=381919
--- Comment #9 from Achim Bohnet <a...@mpe.mpg.de> --- DIRTY unsecure WORKAROUND: Kmail allows in settings -> configure kmail-> security -> tab s/mime validation: enable never consult an CRL Now signature validation works and I could even send for the first time signed and/or encrypted E-mails with kmail. This confirms my suspect from comment 8, that the problem is with an older revoked Certificate of MPG CA. So somehow either kleopatra or kmail fails to handle this case properly. I wish I could remember how and where I once found the info about the revoked certificate of the MPG CA to sent more details. But I don't remember and failed to find it again :-( -- You are receiving this mail because: You are on the CC list for the bug.