Emails Sent from one computer are received, from another they are not
Posted on 2011-10-17
This ranks as one of the strangest things I have seen in many years of working with Outlook and Exchange and therefore truly worthy of 500 points!
In trying to email a legitimate email address at myfairpoint.net, emails get through from Computer A. From Computer B, emails to the same myfairpoint.net address vanish into thin air (they are never received, they never bounce). It's clear from the logs of our Smarthost provider that both sets of emails properly leave our server and properly leave the Smarthost's server, but the results are entirely different. Obviously Fairpoint is treating the emails from Computer A differently than emails from Comptuer B, but what could possibly be different?
And the behavior of Computer B is identical a third computer tested (Computer C). And yet Computer A has no problem.
In all cases, the same domain login account/Exchange Mailbox are used (with results duplicated using a second domain login account/Exchange Mailbox), and the programs in use are identical (Outlook 2007). The environment is Windows Small Business Server 2008, which uses Exchange 2007.
I'm going nuts trying to discover what could be different between the successful computer and the not-successful computers. Since there is no bounce created, I have no message header information to examine for the unsuccessful messages. I do have the message header information for successful messages, of course.
Does anyone have any idea whatsoever??? I did notice that the ethernet adapters on the "not successful" computers are node type "Broadcast" and on the comptuer which is successful it is node type "Hybrid." I can't imagine that has anything to do with anything, though.
Can anyone help?