I'm having this PTR problem when sending to this one particular domain. The the problem happens very intermittently. Sometimes the email would send through but other times it bounces back "The following recipient(s) could not be reached:
on 3/07/2009 8:41 AM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<mail.meyerau.com.au #5.5.0 smtp;554 This server requires PTR for unauthenticated connections.>"
I'm running exchange 2003 internally but our MX records are pointed to messagelabs to do spam filtering (please see attachment for my dns setting). I'm able to send/receive emails from everyone else but this particular domain. What should i do to resolve this problem?