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=d8b63e107589b157d9d7dca9490952dd
But hey, you don't have to leave empty handed!
Here are some things you can try instead: