We have received this error for months every once in a while from random email addresses. I've always assumed they were either not valid, or the mail server on their end was delaying something. This may be the case, however, recently we have been getting this message constantly. We have a mail group that most of our correspondence comes through. When support tickets are opened, when someone places an order, etc. One of the members of this mail group is george@. The message delivery delay we're constantly receiving says: Message is waiting at domain.client.datacenter.com for delivery to email@example.com[SMTP. Reason: Mail Server for firstname.lastname@example.org[SMTP could not be contacted at this time. MailEnable will keep trying to deliver this message and will notify you of any progress. Two problems with this - eorge@ does not even exist as a mail account. And two, the reason says mail server for eorge@ could not be reached, which would presumably be our own mail server, which works just fine. Any help would be much appreciated!