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GTJIT asked
Last Modified: 2015-10-22
We have created two new Mail-Enabled Universal Distribution Group in Exchange 2007; can send messages internally to the group and mail is delivered.  External address (i.e. Gmail, Yahoo, etc.) return the following;

Google tried to deliver your message, but it was rejected by the server for the recipient domain gtjonline.com by mail.gtjonline.com. [].

The error that the other server returned was:
550 Requested action not taken: mailbox unavailable

We have seven other UDG's configured exactly the same that work???
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