Kmail on my woody/sid will only send once. Next time I won't to send a mail I have to shut down Kmail and start it up again.
This has happended to me once before, but it was a long time ago and I don't remember how it was resolved. Here are my kpackages according to apt-show-versions kab/testing uptodate 4:2.2.2-5 kcalc/testing uptodate 4:2.2.2-5 kdebase-audiolibs/testing uptodate 4:2.2.1.0-6 kdebase-doc/testing uptodate 4:2.2.1.0-6 kdebase-libs/testing uptodate 4:2.2.1.0-6 kdebase/testing uptodate 4:2.2.1.0-6 kdelibs3/testing uptodate 4:2.2.2-5 kdepasswd/testing uptodate 4:2.2.2-5 kdewallpapers/testing uptodate 4:2.2.1.0-6 kdm/testing uptodate 4:2.2.1.0-6 kernel-image-2.4.16: No available version kernel-package/testing uptodate 7.75 kfract/testing uptodate 4:2.1.1-6 kjots/testing uptodate 4:2.2.2-5 klogd/testing uptodate 1.4.1-8 kmail/unstable uptodate 4:2.2.2-6 kmix/testing uptodate 4:2.2.2-3 knotes/testing uptodate 4:2.2.2-5 konqueror/testing uptodate 4:2.2.1.0-6 konsole/testing uptodate 4:2.2.1.0-6 kpm/testing uptodate 4:2.2.2-5 kscreensaver/testing uptodate 4:2.2.1.0-6 ksnapshot/testing uptodate 4:2.1.1-6 ksysv/testing uptodate 4:2.2.1-1.3 kview/testing uptodate 4:2.1.1-6 -- o polite

