why does it validate only the sites sets in the rules ?

[petroz]

Why and how to set the rules, valid for any @xxxxx.xxx

 

[stanbusk]

The rules are for address auto-validation for site that will never tell you if an address is good or not. It is for not wasting time with them.

About your question, are you sure it is not a problem with port 25 blocked by your internet provider?