Vacation autoresponder messages
su - user user~# vacation
Run vacation twice if it's a first time user, and give the user bash in the passwd file.
this creates a .forward message with the mailbox to deliver to and a pipe to the vacation program with the aliases to reply for. it then creates a .vacation.msg file with the text of the autoreply and does a vacation -i to initialise.
after vacation is ended, run vacation again to turn it off.
If a user has aliases they need to be added after vacation -a and before the username in the .forward file
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Other ways of doing autoresponders:
piping through yaa http://frost.ath.cx/software/yaa/ (howto http://www.howtoforge.org/autoresponders_for_virtual_postfix_users?s=599ba8c645f33e936910e3055ec886de&)
Use usermin (http://www.webmin.com/index6.html)