I am writing a Script. Now what I want to do is when I send a mail to a list member in a mailman, I want to direct the mail to a program which can be a script or a servlet or anything that can execute on the server. The task of this script shall be to save the received mail to a file.

Can some one tell me how this can be done

You probably want to use procmail as a front to mailman. Modify your alias file and run the message through procmail first, and then pass it to mailman. I did a similar trick to block external e-mails to mailman to prevent non-employees being able to subscribe to our internal lists. Mailman cannot do this. Here is the method:

Modify /etc/aliases:

www-request: "|/usr/bin/procmail -m LIST='www' /etc/mail/procmailrc.lists"

This will call procmail instead of mailman. Mailman is called inside the procmail script:

:0 # pass along all mail for eskom

• ^From:.*eskom.co.za | /home/mailman/mail/wrapper mailcmd $LIST

:0 # reply to all mail not from eskom

• !^FROM_DAEMON
• !^X-Loop: owner-${LIST}@lists.eskom.co.za { :0 hc | (formail -r -A"Precedence: bulk"
  -A"X-Loop: owner-${LIST}@lists.eskom.co.za" ;
  echo "
  This is an ESKOM internal mailing list to which you may not
  subscribe. If you have any queries, contact owner-${LIST}@lists.eskom.co.za
  for further information.") |
  $SENDMAIL -t -f owner-${LIST}@lists.eskom.co.za }

:0 # drop all other mail /dev/null

Using this method and the procmailex manpage, you should be able to do what you want.

-- Richard Ellerbrock richarde@eskom.co.za