[Mailman-Users] unknown mailer error 2

[Panagiotis Malakoudis]

-= Newbie Allert =-

Greetz,

This is the first time I tryied to install mailman and I have a couple o
problems with the way sendmail tryies to send messages.
I get the following error:

Apr 23 15:24:18 scienide sendmail[9542]: f3NCOIw09541:
to="|/home/mailman/mail/wrapper mailcmd scienide",
ctladdr=<scienide-request at scienide.space.gr> (2/0), delay=00:00:00,
xdelay=00:00:00, mailer=prog, pri=30019, dsn=5.3.0, stat=unknown mailer
error 2
Apr 23 15:24:18 scienide sendmail[9542]: f3NCOIw09541: f3NCOIw09542:
DSN: unknown mailer error 2

I use slackware linux 7.1 and the latest version of sendmail. the
program starts with uid/gid mailman and the aliases file is correct.
How can sendmail report that it uses an unknown mailer? Is the mailer it
tryies to use the "mailcmd" I see?
I need help. Thank you all...