Activating the mail function from a local system so it acts like an internet mail server isn't something that is normally done. You can test sending mail from the local system without any fancy setup. I use a mail class called libmail and it dumps the output for you. If you want to test incoming mail, the easiest way is to use a server that already has the mail function working.
If you really want to connect locally as a mail server, then this post may help. You probably need to get a package called Mercury but from the little that I read about it, it isn't for newbies.
chrishea
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