On 3.8.2010, at 22.09, Pašek Ladislav wrote: > Thanks for hint. This is output from gdb bt full but I have no clue what to find in it: > > #0 0x0000003129a32ce2 in unsetenv () from /lib64/libc.so.6 Oh. This again. Just make sure the first setting in your dovecot.conf isn't "something=no". Move it down in the file.