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In lieu: 1) misconfigured MX host (sometimes one of the couple defined will not be appropriate) 2) fouled up (out of date) NS RR records, which could also affect MX records (though they seem consistent for this host) 3) a security authorization system that is unavailable certain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?