My Outlook profile has two accounts:
firstname.lastname@example.org (default profile)
- I create a new message to email@example.com.
- I receive a message reply by the administrator because Exchange does not know 'yahoo.com.'
Why is this happening? What could be going on?
For example, I found that a reverse lookup of one of the yahoo.com mail server's IP addresses returned a domain of servername.mail.yahoo.com as opposed to just servername.yahoo.com. This is close but maybe no cigar for your filters.
In the case of some other ISPs that are being blocked, it is not even close at all. The bad news is that, if you set up an exception for the entire yahoo.com domain, a lot of spam will come through unchecked. If you leave it blocked, you will continue to have this problem.
I think the solution probably lies with yahoo.com and other ISPs.
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