Comment # 8 on bug 1017147 from Keks Dose

(In reply to Luca Beltrame from comment #7)
> To fix the identities, you may want to check ~/.config/emailidentities to
> see whether there are stray entries.
> 
> For the rest, you may want to update to 16.12.1 when it enters TW and see if
> it fixes your problem. Otherwise it's best to file a bug report upstream at
> bugs.kde.org (I saw something similar flying by on IRC yesterday, but it's
> better to have things in a permanent place).

Thank you. Deleting all the "unknown" identities from the file emailidentities
helped!

For the rest: What is the use of Suse's bugzilla, if nobody gives a damn! For
one month kmail is close to unusable and now ! you are telling me to make a bug
report elsewhere.

OK. I did. There already was one: https://bugs.kde.org/show_bug.cgi?id=374734

Clearly, the error came from the update to v16.12, but until today, the bug
isn't even confirmed by the KDE folks.

Sigh... However, thank you for your much appreciated help, Luca.