(Reply from Randy Klumph) Thanks Pete, I'll give those a shot. I suspect it is #4 given the proliferation of poorly constructed spam blockers out there these days. - Pete Weiss wrote: >Try some test emails directly to him using each of the direct MX >hosts >as your SMTP outbound gateway > >Query:Mail Exchange (MX):optusnet.com.au >optusnet.com.au MX 100 new-mail.optusnet.com.au >optusnet.com.au MX 25 mail.optusnet.com.au > >In lieu: > >1) misconfigured MX host (sometimes one of the couple defined will not >be >appropriate) > >2) fouled up (out of date) NS RR records, which could also affect MX >records (though they seem consistent for this host) > >3) a security authorization system that is unavailable certain hrs due >to >maintenance which rejects mail > >4) an intermediary anti-spam system that "eats" the distribution > > > >/Pete > >At 13:55 08/10/2004 Tuesday, Randy Klumph wrote: >>I'm at a loss to explain why this may be occurring. Any ideas?