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=516e46a0fa1cafb7aa4b9c5d7a841ed3
But hey, you don't have to leave empty handed!
Here are some things you can try instead: