This one was tough!
I was always intimidated by sendmail :) My interaction to it was limited to disabling it at startup because it used to hang at bootup :)
For the home server, decided to set it up so that I could be notified for different events. There are many links that explain how to setup sendmail for gmail but it took me little longer to decipher it and get it up. Config is complicated by the fact that gmail uses SSL for mail acceptance via SMTP and sendmail is not friendly for beginers :)
Check out the links that were more useful
http://www.brennan.id.au/12-Sendmail_Server.html
http://rajasuperman.blogspot.com/search?updated-max=2006-09-08T15%3A47%3A00-07%3A00&max-results=4
After lot of fiddling around, the mails started flowing :)
