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.
Do you have comments on this Ask the Expert Q&A?Let us know.
Dig Deeper on Spam and virus protection
Related Q&A from Richard Luckett
Some folders in a mailbox on Exchange Server 2013 are not showing up on the folder list in the OWA virtual directory but do appear in other views.continue reading
We have a Client Access Server and Mailbox Server on Exchange 2013 and we want to install an Edge Transport role on another machine. I joined the ...continue reading
How can I enable Outlook Anywhere to allow internal use for all users and external use for only some users in Exchange 2013?continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.