We tried, but could not find /doku.php?id=doku.php.faq:troubleshooting:citserver_crashes_when_running_on_debian_linux_when_sending_out_internet_email._fix&do=login§ok=e649f1b63d96afff2006a882afc0e7c6
But hey, you don't have to leave empty handed!
Here are some things you can try instead: