At the site where i admin we have groups ie main, user etc etc the main get e-mail with there registration i need to know how i would setup email for the new main members while i was looking on the ftp part of the site i noticed some files and have found that its on a Linux server the file containded /home/username /bin/bash while im looking at this file ive noticed that all the main members have a home dir and have put two and two together and cam up with 4

I know this is not a lot of info but you know what i know apart from admin pass

the site is a php-nuke site ive checked in the admin section for the tools i need but to no avail.
please help
Thanks