Version: unspecified (using KDE 4.6.0)
After the expiration of the signing key the signature is shown as invalid. Not even the details give any hint to the real problem. Even worse: It is as far as I can see exactly the same behaviour like with a bad signature.
GnuPG knows these statuses for signatures (see /usr/share/doc/packages/gpg2/DETAILS):
It seems to me that kmail tells apart only GOODSIG on the one hand and the rest on the other. And for the first case the different TRUST_* levels.
I think this can be considered a bug.
Steps to Reproduce:
Click on the mail.
EXPSIG and EXPKEYSIG should be treated like the combination GOODSIG/TRUST_UNDEFINED i.e. show the mail border in yellow and tell the user about the problem in the details section.
Will look at.
I confirm this occurs also in Kmail 4.9.5, in Ubuntu 12.10.
And in Kmail shipped with KDE 4.10.1, too.
Strongly related to bug 64424
This bug has only been reported for versions before 4.14, which have been unsupported for at least two years now. Can anyone tell if this bug still present?
If noone confirms this bug for a Framework-based version of kmail2 (version 5.0 or later, as part of KDE Applications 15.12 or later), it gets closed in about three months.
Just as announced in my last comment, I close this bug. If you encounter it again in a recent version (at least 5.0 aka 15.08), please open a new one unless it already exists. Thank you for all your input.