[Mailman-Users] same message

[Admin]

Hello,

Sorry for being so unpatient that I have not subscribed to the list but I 
have a very urgent problem to solve.
I am using postfix (1.1.11) + mailman (2.0.11) at my site. There are many 
lists and members who have subscribed to multiple lists. If a message is sent 
to multiple lists, and one is a member many of the lists, he/she gets 
multiple copies of the same message. How can I prevent this?
Another thing is that if someone posts to a list, and he/she is a member, 
he/she gets the mail. Is there any way to prevent this?

Thank you,
	Fulop Balazs