Oh! I thought you wanted to get rid of squirrelmail footer -- my bad!
Adding a Disclaimer note through MTA is a difficult task. I think it can not be done by MTA alone. Reason being email messages will be a combination of text/html and-or MIME attachments. So how does an MTA know where to insert the disclaimer? -- It will therefore need milters that handle such tasks -- for instance, Mimedefang can do it for sendmail [currently using Mimedefand with sendmail to insert in to headers (which is easier than disclaimer, i guess) but it is resource hungry, being a perl script]. Or you can use things that can tackle MIME.. for instance gmime libraries. Since we are still working on it (on modded-qmail), I cannot for sure say the outcome of email messages when being altered in this manner. In our tests we have sometimes ended up with three line email messages which contain just the first 2-3 lines of header-- body and attachment lost. While I was tying this response came across qmailrocks thread that may help you.. http://forum.qmailrocks.org/showthread.php?t=2412 But in the end it says the same thing... when attachement is there, disclaimer may fail. check it out and let us know if it worked well for your setup. If it did, do not forget to give us an overview of your system. regards! [Non-text portions of this message have been removed]
