On Fri, 02 Mar 2001 13:58:34 EST, "Keller, Richard (CIT)" <[log in to unmask]>  said:
> We're running some exercises on a LISTSERV test box and I'm receiving the
> following messages in the LISTSERV logs:

> -> MAIL FROM:<>
> 550 5.7.1 Access denied

OK.. Your Sendmail/LSMTP/Qmail/whatever is severely hosed up, and
giving 550 errors *even for addresses required to work* (see RFC1123
where <> is *required* to be accepted).  Check the Sendmail/LSMTP/qmail/etc
logs, and see *why* it's doing it, and fix it.  My first guess is however
that the actual IP address of the machine doesn't match the IP address
that belongs to the hostname that your MTA thinks it's running on,
causing it to think that it has to relay the mail.

If you cloned your "test box" from your production environment, you probably
missed a place where you needed to change (for example) listserv.nih.gov
to listserv-test-box.nih.gov in some config file or other (the sendmail.cf
'Dj' and 'Cw' config macros are common offenders here)

                                Valdis Kletnieks
                                Operating Systems Analyst
                                Virginia Tech