Version: 1.12.2 (using KDE 4.3.2)
Installed from: Ubuntu Packages
I cannot _sign_ mail (test mails i send to myself), but i can crypt/decrypt them.
Kmail complains about "wrong pass phrase" when i try to sign a mail, but it did not asked for it (and i can crypt/decrypt whith the same key and passphrase)
100% reproducible currently.
I had this problem in the past, it works here now, using
KDE Version 4.3.72 (KDE 4.3.72 (KDE 4.4 >= 20091015))
KMail Version 1.12.90
Thanks for reporting
*** This bug has been marked as a duplicate of bug 179997 ***