receive mail with sendmail

Could any one please give links to any blogs (etc) which gives a
detailed description on receiving emails to rails application with
sendmail. I am using fedora12. I request help on configuring mail server
(if needed) or can use mail server of another domain and forward it to
my application. Dont know how to, since I am prety new to this. If what
I am asking is blunder please excuse


Have a look at this:

Hope it helps.