[Mailman-Users] Problem with subdomain

[MrJacK]

Hi,

I have just setup Mailman with Postfix. Normal user ( ex :
toto at domain.ain ) are store in a MySQL database. So for the mailing list
i have decide to take lists.domain.ain
If i send a mail to test at lists.domain.ain all work perfectly. But if i
send a mail to test at domain.ain i have the following error in postfix:

postfix/virtual[6372]: 3F06E3ECE3: to=<|/home/mailman/mail/mailman post
test at domain.ain>, relay=virtual, delay=0, status=bounced (unknown user:
"|/home/mailman/mail/mailman post test at domain.ain")

And a mail for the error is send to the sender with the full path of my
mailman installation. Why it doesn’t send a simple user unknow error msg
?

Thanks for your help.

Regards,

Raphaël