[Mailman-Users] I send mail to the address of my list and nothing happens?

[syntax at crackcrew.org]

when i send a message to the list, or when mailman tried to send messages
to the owner or new subscribers nothing happens?  I tried to send a single
message to the list and got this in my /var/log/maillog

Aug 14 19:12:10 civic sendmail[950]: f7ENCAx00948:
to="|/home/mailman/mail/wrapper post crackcrew",
ctladdr=<crackcrew at crackcrew.org> (8/0),
delay=00:00:00, xdelay=00:00:00, mailer=prog, pri=30526, dsn=2.0.0,
stat=Sent

system:
RedHat 7.1/sendmail
python 2.1.1
mailman 2.1a2


any ideas?

Thanks,
Matt