Prog mailer (/bin/sh) exited with EX_TEMPFAIL

Just installed RT3.0.1 on FreeBSD 4.8 using bsdpan_mod_perl_1.27, apache
1.3.27, sendmail 8.12.8, and mysql 4.1.0. Mail seems to just sit in the
mqueue with EX_TEMPFAIL. Any thoughts?

Customers emailing in replies to tickets.
Emails get stuck in mailqueue with the message in the
Subject.
This is RT-3.2.2 on a SPARC/Solaris 9 box.
I looked into the archives of this list somewhat and
one person suggested running one of the emails through
rt-mailgate using --debug flag.
I did, and here’s the output:

System error
error: Can’t call method “_Accessible” on an undefined value at
/usr/local/lib/perl5/site_perl/5.8.5/DBIx/SearchBuilder/Record.pm line 406.
context:

402: my $self = shift;
403:
404: no strict ‘refs’;
405:
406: if ($AUTOLOAD =~ /.*::(\w+)/o && $self->Accessible($1,‘read’) ) {
407: my $Attrib = $1;
408:
409: *{$AUTOLOAD} = sub { return ($
[0]->_Value($Attrib))};
410: return($self->_Value($Attrib));

code stack:
/usr/local/lib/perl5/site_perl/5.8.5/DBIx/SearchBuilder/Record.pm:406
/usr/local/rt3/local/lib/RT/Interface/Email/Auth/MailFrom_Local.pm:46
/usr/local/rt3/lib/RT/Interface/Email.pm:500
/usr/local/rt3/share/html/REST/1.0/NoAuth/mail-gateway:31

My brain is pretty stuffed this week from all the other borken hardware
and software. I’d prefer not to “try the latest version” as I remember
much pain and suffering getting this to work the first time on this
box. As much as I hate saying this, could you solve my problem for
me?

Regards, Scott