Comment 9 for bug 107107

> It would be great if the patch could get improved and applied for Kubuntu.

I second that. The point of the KDE developers is really annoying: Because there is the small possibillity of a mitm-attack you shouldn't be allowed to send encrypted mail to keys you didn't sign, but if you really want to, you could do anyway by applying one or another complicate workaround that as a side-effect could be harmful to the web of trust.

This should be patched. And the KDE developers at least don't seem reluctant to incorporate such fix:
"General reply: We do not have the time/resources to implement this low-priority wish, but if someone provides an acceptable patch we'll consider it for inclusion."