Your message did not reach some or all of the intended recipients.
Subject: RE: DBA701 - Urgent
Sent: 4/13/2004 5:39 PM
The following recipient(s) could not be reached:
'test@testdomain.com on 4/15/2004 6:00 PM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
The problem turned out to be that there were no PTR records set up for the outside IP address. We had to find the problem by doing a search of the PTR records on www.dnsstuff.com using this format
45.123.17.77.in-addr.arpa, the outside address is 77.17.123.45.
Of course now the format has changed at dnsstuff.com and you can just enter the IP address in the Reverse DNS Lookup box. While you're there you might as well get a full DNSReport too.
These errors can be pretty easy to troubleshoot if you use the error codes, You can reference those error codes using this document http://www.unixhub.com/docs/email/rfc1893.txt
Others have found out that their IP has been blacklisted, Am I blacklisted?
SMTP mail cannot be sent or received in Exchange Server
