[Mailman] Much ado about relay

[HellBender]

I'm running Postfix as my MTA with Mailman, and I'm having a bit of trouble. I've created a list in Mailman, added subscribers, and stuck the info into /etc/aliases. However, when I email the listname@domain.com address, it bounces back as "Unknown User." Here's what shows up in /var/log/maillog:

Nov  5 00:24:51 fanime postfix/smtpd[18966]: connect from rproxy.gmail.com[64.233.170.198]
Nov  5 00:24:51 fanime postfix/smtpd[18966]: 2144F20BA: client=rproxy.gmail.com[64.233.170.198]
Nov  5 00:24:51 fanime postfix/cleanup[18969]: 2144F20BA: message-id=<4b398499041105002321e617d9@mail.gmail.com>
Nov  5 00:24:51 fanime postfix/qmgr[18963]: 2144F20BA: from=<zainie@gmail.com>, size=1236, nrcpt=1 (queue active)
Nov  5 00:24:51 fanime postfix/virtual[18970]: 2144F20BA: to=<famine@fanime.kicks-ass.net>, relay=virtual, delay=0, status=bounced (unknown user: "famine@fanime.kicks-ass.net")
Nov  5 00:24:51 fanime postfix/cleanup[18969]: 3C5E620BC: message-id=<20041105082451.3C5E620BC@fanime.kicks-ass.net>
Nov  5 00:24:51 fanime postfix/qmgr[18963]: 3C5E620BC: from=<>, size=2956, nrcpt=1 (queue active)
Nov  5 00:24:51 fanime postfix/qmgr[18963]: 2144F20BA: removed
Nov  5 00:24:51 fanime postfix/smtpd[18966]: disconnect from rproxy.gmail.com[64.233.170.198]
Nov  5 00:24:53 fanime postfix/smtp[18972]: 3C5E620BC: to=<zainie@gmail.com>, relay=gsmtp171.google.com[64.233.171.27], delay=2, status=sent (250 2.0.0 OK 1099643002)
Nov  5 00:24:53 fanime postfix/qmgr[18963]: 3C5E620BC: removed

Here's my main.cf file for Postfix: http://fanime.kicks-ass.net/main.cf

I've been following the instructions on this page: http://www.syntheticzero.com/howto/vmail.php

If I had to guess, I'd say my problem was the relay... The log entry for recieving the email says relay=virtual while the log entry for sending the "User Unkown" email back to the server says "relay=gsmtp171.google.com[64.233.171.27]"... and the latter works.

Can anyone tell me what I'm doing wrong?