[Mailman-Users] Multiple domains

[George]

Is there any way to handle multiple domains in Mailman 2.1.19?

I have apply the patch from http://nxsy.org/139.html and this way I have 
a list called mydomain.com-list.

The issue is that if I'm posting to mydomain.com-list at mydomain.com 
everything seems to work fine. However, when posting to 
list at mydomain.com the mail is set to quarantine.

I have tried to rewrite the address on postfix (using alias) to match 
mydomain.com-list, but it still doesn't work.

Any idea how can I make it working? Why is Mailmain complaining about 
"Message has implicit destination"?

I'm using postfix with virtual domains, mysql and mailman.

Any help is more than appreciated!!
TA
Jorge