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Thanks for the feedback. All 4 MX records are required. Two go to Barracuda Networks corporate spam filters, which hand off to ours, and 2 go directly to ours. The cloud-based ones are there in case our Internet goes down, or power goes out or whatever. We have figured out what was...

Thanks for asking. The domain to which mail is going is prodtoolcorp.com. We are aware of issues when email is sent from Yahoo or AOL. (Likely the same issue, since those two services appear to have the same back end.) To our knowledge, no other organizations are having this issue...

I have to say, first, that trying to get assistance from Yahoo is horrible. We are having problems RECEIVING mail FROM YAHOO addresses. They send mail to us and it is not delivered. Our spam filter never shows the message ever reached it, yet the Yahoo accounts from which the mail is sent get...