[Mailman-Users] User unknown in virtual mailbox table

[Umarzuki Mochlis]

Hi,

I created a list from the admin interface, not from CLI. I administator of
that list do not get the list creation notification & I found these messages
in /var/log/mailman/smtp-failure

Dec 16 13:49:13 2010 (26989) All recipients refused:
{'umarzuki at mydomain.com.my': (550, '5.1.0 <test02-bounces at mydomain.com.my>:
Sender
address rejected: User unknown in virtual mailbox table')}, msgid:
<mailman.0.1292478551.30057.test02 at mydomain.com.my>
Dec 16 13:49:13 2010 (26989) delivery to umarzuki at mydomain.com.my failed
with
code 550: 5.1.0 <test02-bounces at mydomain.com.my>: Sender address rejected:
User
unknown in virtual mailbox table

# cat /var/log/maillog | grep test02
Dec 16 13:49:13 hpj-mail postfix/smtpd[30059]: NOQUEUE: reject: RCPT from
localhost.localdomain[127.0.0.1]: 550 5.1.0 <test02-bounces at mydomain.com.my
>:
Sender address rejected: User unknown in virtual mailbox table;
from=<test02-bounces at mydomain.com.my> to=<umarzuki at mydomain.com.my>
proto=ESMTP
helo=<mail.mydomain.com.my>

This installation in on centos 5.5

What should I do next so I can send and receive email to this list (test02)?