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=934f85f8115523a697858cd585b37221
But hey, you don't have to leave empty handed!
Here are some things you can try instead: