Vlk
6
I find it strange that in the mail protection wizard for i.p number it uses 127.0.0.1 if I remeber correctly that i.p number is a loop back and is only use for testing. Please correct me if I am wrong.
OK 
127.0.0.1 is indeed a (testing) loopback, but is commonly used (imho in all socket implemenetations, not only under Windows) is a (pseudo-) address of the local computer. That is, it’s just the address of the computer itself.
And since the avast mail proxies run on the computer itself, it’s quite reasonable that the Mail Protection Wizard changes the server settings to 127.0.01. No magic, really.
Hope this helps,
Vlk