How can I remove or change the text appended to each email sent through IMP?
[IMP 3.x]: IMP automatically appends the content of the file horde/imp/config/trailer.txt to each email it sends. You can disable this by setting the configuration option $conf[‘msg’][‘append_trailer’] to false in your horde/imp/config/conf.php file. If enabled, you can change the message by simply editing the contents of horde/imp/config/trailer.txt to suit your needs. Please note that this is a text file, and should not contain html or php code but only normal text.