Web Database Step-by-Step Guide: “Okay, now there is a default footer that gets appended to every message sent from IMP, this is in the file /home/httpd/private/horde/imp/config/trailer.txt. You can set this to whatever you like, I just clear mine out:
$ cd /home/httpd/private/horde/imp/config
$ cat /dev/null > trailer.txt”