mailman configuration: Command died with status 1

[kaesar]

Hello,

we are plesk 11.0.9 runnning in Debian 6.

the mailmann configuration en master files is:

mailman unix - n n - - pipe flags=R user=list:list argv=/usr/lib/plesk-9.0/postfix-mailman ${nexthop} ${user} ${recipient}

But with this configuration I have this errors:

Command died with status 1: "/usr/lib/plesk-9.0/postfix-mailman". Command output: post script, list not found:

This issue, is solved add flags u:

mailman unix - n n - - pipe flags=R user=list:list argv=/usr/lib/plesk-9.0/postfix-mailman ${nexthop} ${user} ${recipient}

is't possible use this configuration in our templates?

Thanks