[Mailman-Users] unknown mailer error 2

[stefano danovaro]

 Hi
 I have installed Mailman2.1b1 and when I send email at the list I receved this 
message:


   ----- The following addresses had permanent fatal errors -----
 "|/home/mailman/mail/mailman post sbn-liguria"
    (reason: 2)
    (expanded from: <lista at liste.XXX.it>)

   ----- Transcript of session follows -----
Failure to exec script. WANTED gid 1, GOT gid 8.  (Reconfigure to take 8?) 554 
5.3.0 unknown mailer error 2

Hve idea?

Thanks,
Stefano