I use iredmail08.1 ubuntu12.04lts and mysqlbackend

I use postfix on ubuntu 12.04lts.

I installed mailman following the "http://www.howtoforge.com/installing-ir … an-squeeze"

it works but as reciped when i add a newlist postfix
postconf -e 'relay_domains = lists.example.com'

also into phpadmin

and upon execute newlist mailman
I don't get the mailinglist mail. because i get an error;
Oct 3 12:02:00 postfix1 postfix/trivial-rewrite[12259]: warning: do not list domain lists.example.com in BOTH virtual_mailbox_domains and relay_domains

But if I don't add lists.example.com into relay_domains and execute newlists mailman@example.com, i get the mail and the list works well.

How can i correct the problem ?