After the upgrade to GW 8, our automated emails via SMTP are not working to distribution lists. Have read a few posts here and am getting more confused.
The server is denying the email based on this statement - DMN: MSG 113993 Recipient unknown: list@domain

Have tried the Tools, GSO, Internet Addressing.. Publish Nicknames.

How do I get it to recognize the GW Distribution list email? Know this is not much info, but am just getting back into administering this system.