02-29-2012 9:03 AM
02-29-2012 9:34 AM
In the original post I neglected to mention that the senders do not receive an NDR.
03-15-2012 1:47 PM
I resolved the problem. After hours of Googling around, I found a posting that gave me the clue to a solution. Unbeknownst to me, ATT/Yahoo implemented a spam filter on my email account that was blocking some of the incoming messages.
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