[Mailman-Users] 554 "|/home/mailman/mail/wrapper mailowner test"... unknown mailer error 2

[alfred]

Hi,
    Would you help me?
    After I install mailman with my FreeBSD 3.3 and Apache 1.3.9,
Sendmail 8.9.1a, when I mail to test-admin of maillist test , it run
error, Like this:

   ----- The following addresses had permanent fatal errors -----
"|/home/mailman/mail/wrapper mailowner test"
    (expanded from: <test-admin at xxx.xxxx.com>)

   ----- Transcript of session follows -----
554 "|/home/mailman/mail/wrapper mailowner test"... unknown mailer error 2


why or how to do?

bst rgds.