I have Exchange 2003 and appear to be having reverse DNS lookup problems or possibly SMTP configuration issues. We can send email to any destination when we have a smart host specified in SMTP properties but experience return emails from specific destinations (ex. hotmail accts) when not using a smart host.
I want to permanently remove the smart host setting but cannot until I resolve the issue.
note: when not using smart host: return emails specify our local domain mail.gcps.local verses mail.greensville.k12.va.us which we are suppose to see.
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