Using local mail (/var/mail/user) » themattharris.com
“When developing websites it is quite common for there to be some kind of contact form or other mailing function. The problem is that should you, like me, have your email being forwarded through Google Mail you will find those emails never get to your Google address. The reason for this is simple, your computer is not recognised as a legitimate SMTP server so Google rejects the mail. The good news is you can instead tell your Website to send the emails to your local computer instead.” — via Using local mail (/var/mail/user) » themattharris.com.
While I don’t need this at the moment, I did find it worthy of bookmarking since it does come up from time to time.