[Mailman-Users] install mailman with postfix question

[=?Big5?B?s6+5bL9w?=]

Hi all ,

    I install mailman on my Mandrake 8.0 , and follow the Install doc in
mailman package , step by step.
But now when I send mail to maillist , it only receive on the aliases
account. I ask my friend , he said that I must use a filter , but a still
don't understand what I must setup ?