[Mailman-Users] virtual domain

[Dony Tata]

how to configure virtual domain in postfix + mailman? in my mm_cfg.py i configure like this
MTA = 'Postfix'
POSTFIX_STYLE_VIRTUAL_DOMAINS = ['doma.ac.id','domb.ac.id']
in postfix/main.cf, configure like this 
virtual_alias_maps = hash:/etc/mailman/virtual-mailman
alias_maps = hash:/etc/aliases, hash:/etc/mailman/aliases
alias_database = hash:/etc/aliases, hash:/etc/mailman/aliases


i have sucsess create new mailing list "abc at doma.ac.id " i have sucsess subscribe member,but if  a member  send  mail to  abc at doma.ac.id, i have got error 
<abd at doma.ac.id>"Host or domain name not found. Name service error for name=doma.ac.id type=A: Host not found>


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