Answer myself: There is ~/.config/kmailrc, which got the known mailaddresses with names. However, when I delete them in this file and restart kmail, the mail addresses I sent to in the past. are not forgotten. So there is no change in the behavour.
This led me to the conclusion, that these information must be stored somewhwere else. > Yes, I got a newer one. Kmail2 in debian/testing. And sadly - there is no > kmailrc any more. I know about that file, but looks like it is needed no > more. I am not sure, I believe, this is since the introduction of akonadi. > > Best > > Hans
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