Exchange 2007 Enterprise SP3 Rollup 11.
Windows Server 2008 Enterprise
Let me state first that we are not experiencing any chronic delivery issues, delays or NDRs in our queues. However, we have a particular issue with one domain where emails will not be delivered. When trying to telnet to the mail server (mail.webpage.t-com.de) I get the following error:
554 - A problem occurred. (Ask your postmaster for help or to contact email@example.com to clarify.) (BL) Connection to host lost.
In my Exchange Queue Viewer I have a test message sitting there with a 400.4.4.7 Message delayed.
All of this is very ambiguous. My question is, How do you find a more defined cause of why messaged or delayed or not delivered? How can we tell if its because of a black list, or non PTR record or any number of reasons why a message may be dropped or not delivered? I looked through the SMTP logs but can not find this message that is currently in the queue delayed.
I would like to see something that say, "Hey, Buddy. We could not deliver your message because the receiving server is a dolt and thinks your message is coming from a SPAM IP address."
All kidding aside, how does one go about finding the root cause of a delivery failures without more information? Obviously, the recipient is saying, "Well, we are receiving email from others OK. it must be you." And we are thinking, "Well, we can send to everyone without failures, so it must be them."
Thank you in advance.