[Mailman-Users] problems setting up..

[Tom Bowman]

I just installed mailman on a slackware Linux box i am running.. it's
currently using sendmail 8.9.3/8.9.3 .. 
if i send an email to the list i have setup (which appears to be setup
properly)
i get this error in my /var/adm/maillog:

May 13 09:00:46 absolut sendmail[4667]: JAA04667:
from=<tbowman at sequeltech.com>, size=450, class=0, pri=30450, nrcpts=1,
msgid=<81DCCCD6EFCED011AB5200805FA6FBC98ADF40 at bellprod.sequeltech.com>,
proto=ESMTP, relay=[207.109.88.2]
May 13 09:00:47 absolut sendmail[4668]: JAA04668: clone JAA04667,
owner=posse-admin
May 13 09:00:47 absolut sendmail[4668]: JAA04668:
to="|/personal/mailman/mail/wrapper post posse", delay=00:00:01,
xdelay=00:00:00, mailer=prog, stat=unknown mailer error 126
May 13 09:00:47 absolut sendmail[4668]: JAA04668: JAB04668: DSN: unknown
mailer error 126
May 13 09:00:47 absolut sendmail[4668]: JAB04668:
to="|/personal/mailman/mail/wrapper mailowner posse", delay=00:00:00,
xdelay=00:00:00, mailer=prog, stat=unknown mailer error 126
May 13 09:00:47 absolut sendmail[4668]: JAB04668: to=MAILER-DAEMON,
delay=00:00:00, mailer=local, stat=User unknown
May 13 09:00:47 absolut sendmail[4668]: JAB04668: JAC04668: return to
sender: User unknown

when mail is sent to posse at leech.org  [posse is the name of the list]
..

/etc/aliases:
mailman: juice at leech.org
mailman-owner: mailman at leech.org
posse:                   "|/personal/mailman/mail/wrapper post posse"
posse-admin:             "|/personal/mailman/mail/wrapper mailowner posse"
posse-request:           "|/personal/mailman/mail/wrapper mailcmd posse"
owner-posse:             posse-admin
posse-owner:             posse-admin

..

any ideas would be greatly apreciated.. 

thank you..
tom