I have a set of mail contacts for external domains that are part of distribution lists. When first installing Exchange, I did a mass import via shell cmd, and CSV file. All of these are able to receive email from the server without any issue. I was recently asked to add another account to one of the distribution lists, which I created with the EMC. Now when I try to send a message to the new receipient, I get the error below:
Postini
#550 5.1.1 User unknown ##
I have other recipients that are in the same domain as this account, and they are able to receive email from our domain, but email to this account does not appear to leave our server. I have checked permissions, and cannot find any difference between this account and others.
Any help would be appreciated.
Steve