Version:           1.10.0 (using 4.1.00 (KDE 4.1.0), Debian packages)
Compiler:          cc
OS:                Linux (x86_64) release 2.6.26-melech

Kmail crashes often after sending a mail. The mail was sent out correctly. I had no Kmail windows open at the time, just a composer window launched from a mailto: URL.

Program: Kmail (kmail), signal SIGABRT
[Thread debugging using libthread_db enabled]
[New Thread 0x7f01bf3d3780 (LWP 28737)]
[KCrash handler]
#5  0x00007f01bc409ef5 in raise () from /lib/libc.so.6
#6  0x00007f01bc40b413 in abort () from /lib/libc.so.6
#7  0x00007f01bd7fe4f5 in qt_message_output (msgType=QtFatalMsg, 
    buf=<value optimized out>) at global/qglobal.cpp:2061
#8  0x00007f01bd7fe637 in qFatal (msg=<value optimized out>)
    at global/qglobal.cpp:2263
#9  0x00007f01beba7018 in KMail::MessageProperty::forget (msgBase=0x13220f0)
    at /build/buildd/kdepim-4.1.0/kmail/messageproperty.cpp:180
#10 0x00007f01bec013c3 in ~KMMsgBase (this=0x7041)
    at /build/buildd/kdepim-4.1.0/kmail/kmmsgbase.cpp:124
#11 0x00007f01bea61369 in ~KMMessage (this=0x13220f0)
    at /build/buildd/kdepim-4.1.0/kmail/kmmessage.cpp:225
#12 0x00007f01bec094a2 in KMMsgList::clear (this=0x8ba068, doDelete=true, 
    syncDict=false) at /build/buildd/kdepim-4.1.0/kmail/kmmsglist.cpp:37
#13 0x00007f01bec7540a in KMFolderMaildir::close (this=0x8b9ff0, 
    aForced=<value optimized out>)
    at /build/buildd/kdepim-4.1.0/kmail/kmfoldermaildir.cpp:216
#14 0x00007f01bec9044d in KMKernel::cleanup (this=0x7fffc751f690)
    at /build/buildd/kdepim-4.1.0/kmail/kmkernel.cpp:1668
#15 0x0000000000402f96 in main (argc=<value optimized out>, 
    argv=<value optimized out>)
    at /build/buildd/kdepim-4.1.0/kmail/main.cpp:148
#0  0x00007f01bc4760b0 in __nanosleep_nocancel () from /lib/libc.so.6