On 8.7.2010, at 19.57, Ray Kirby wrote: > Jul 08 12:35:08 master: Error: service(auth): child 5516 killed with signal 11 (core dumped) Could you get a gdb backtrace? It said core dumped, so there should be one in base_dir (doveconf base_dir). Then you can do: gdb /usr/local/libexec/dovecot/auth /usr/local/var/run/dovecot/core bt full or something