Agnello George wrote:

Hi I have searched for a document ion that allows a mail server to automatically add a banner to the message that sender composes, but found none . For eg: when you send a mail from yahoo.com the recipient to whom the mail is sent receives the mail and at the end of the message a banner or advertisment that says "click here"

It would be better if you look for it with reference to your mail server. Try keywords like 'insert disclaimers ads' etc.

I found this interesting link for anyone who is interested in setting up mail servers.

http://www.hypexr.org/linux_mail_server.php