[Mailman-Users] More help - please

[John Dennis]

Did you look in the mailman logs?
Did you look at the system log file?

I assume since you can see your message in the mm queue parts of mail
are running, but some reason its not getting into the MTA?

Have you verified you can use SMTP with postfix?
Have you configured the postfix local SMTP delivery?
Are you having a postfix vs. sendmail personality conflict? (e.g. some
postfix files can be installed to emulate sendmail)
What happens when you "telnet localhost 25"?