Problem solved:
Deleting and reimporting of the root and the class 3 certificate helped.
** Changed in: evolution (Ubuntu)
Status: New => Invalid
--
Own certificates are marked as not valid
https://bugs.launchpad.net/bugs/447078
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** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/33348152/Dependencies.txt
** Attachment added: "ProcMaps.txt"
http://launchpadlibrarian.net/33348153/ProcMaps.txt
** Attachment added: "ProcStatus.txt"
http://launchpadlibrarian.net/33348154/ProcStatus.txt
** Attachm
Public bug reported:
Binary package hint: evolution
Own CACert certificates can be imported but emails with this certificate are
marked as not valid.
Furthermore i'm not able to make a new email and sign it with my own
certificate (cause it's invalid).
This is Karmic 9.10 and evolution 2.28.0