[feature] IP address blacklist

[gugu]

Right now this module uses third-party module to detect disposable domains. The problem is that it is a way to nowhere because they register a new domain every day.

I would like to suggest a different approach - blacklisting IP instead. It is much harder to get a new IP subnet. As this module already establishes a TCP connection, it can check if the IP is blacklisted. This way it is possible to make blacklist shorter and more reliable