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[cobalt-users] Relaying denied. IP name lookup failed message



Hi Folks,

I have a user, new setup, Microsoft Outlook, that can receive email fine but
cannot send it to certain folks.

The error message (with personal stuff replaced with x's) is:

550 5.7.1 <xxxx.xxxxxx@xxxxxxxxxx>... Relaying denied. IP name lookup failed
[172.16.2.21]

We are using the Qube 3.

Thanks for any light someone can shed on this !

Chuck