[Mailman-Users] Problem with fresh installation of mailman

[AlxFrag]

Hi all,

i've been using mailman-2.1.9 about a year now without problems.

I've set up a new mail server (postfix) and installed mailman again. 
I've succesfully created a new list called "mylist".

But, if i try to send an email to mylist at mydomain postfix replies that 
this user does not exist:

Jan 24 15:01:41 posidon postfix/virtual[15195]: CCB0E1089AC: 
to=<mylist at mydomain>, relay=virtual, delay=3.1, delays=2.8/0/0/0.34, 
dsn=5.1.1, status=bounced (unknown user: "mylist at mydomain")



In main.cf i have:

alias_maps=hash:/usr/local/mailman/data/aliases
virtual_alias_maps=hash:/usr/local/mailman/data/virtual-mailman

in mm_cfg.py:

MTA='Postfix'

POSTFIX_STYLE_VIRTUAL_DOMAINS=['mydomain']

add_virtualhost(DEFAULT_URL_HOST,DEFAULT_EMAIL_HOST)

add_virtualhost('mydomain','mydomain')

Any ideas?

Thanks in advance,

Alex