I am in the process of trying to add an external email address to some of our internal Distribution Lists and am not having much luck. This is the first time we have wanted to add an external user so I started from the beginning by following these steps: Support | Adding Internet Users to the Address Book and Distribution Lists.

The issue comes when sending to the list, I have one internal user and one external user for testing. The internal user gets the email fine, but I get a reply back stating "Item to user(s) at External Domain.External PO was undeliverable, subject: Test".

I followed the steps here Support | Cannot send mail to External domain for verifying I have the external domain linked correct and everything I look at says I do.

We are running GW8. Any thoughts on where I should look next?

Thank you