Hi,
you should be able to look in the smtp log to see the traffic going through the proxy.
I am not sure how quick you were making the changes then testing, but you need to allow a minute or two for the changes to take affect.

Ian M

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Home Power User unlimited licence - v7.50x - AMD X2 5050e with 2gb,1 intel NIC, the onboard NIC and netgear gs108t with vlans.