I added one more LDAP attribute in iredmail ldap schema and mysql template file, you can store your disclaimer text in LDAP or MySQL now.
http://code.google.com/p/iredmail/sourc … 9ea52c1958

Since alterMIME can't read disclaimer text from LDAP or MySQL directly, you have to write a small script to dump disclaimer text to file system, and setup a crontab job to dump it every 5 minutes/1 hour/1day or whatever interval you like.

Of course you can extend your own web-based iRedMail management tool, so that your customers can edit disclaimer.

Enjoy.