I keep getting an error message (notification of delivery failure) after I send a message to one of my mail recipients. The message is not delivered because of Illegal host/domain name found. It is not an illegal host, because I was able to send e-mail to that addressee 4 days ago. But not now. The host/domain name for the recipient is @mtvac.net I can receive mail from the recipient. Any ideas what is going on?
The first thing I would check for is a typo in the address. Then I would probably try to send mail to that address via another provider (gmail, yahoo, etc) and see if I get the same error there. This would help determine whether the problem is with the 3rd party account or the verizon.net account.
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