John Thomas wrote: > Any suggestions to help me troubleshoot a "killed by signal 11" problem > with Postfix? I've Googled and fiddled, but cannot figure it out. I > have no idea where to look/start. > Debug with gdb. Enable in main.cf debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin gdb $daemon_directory/$process_name $process_id 2>&1 > $config_directory/$process_name.$process_id.log & sleep 5 debug_peer_level = 2 #debug_peer_list = some.domain Set some.domain to an ip address of a host where you can run telnet to connect to port 25 of the postfix server. This will create a file(s) in /etc/postfix