I want to be able to send a single message, using either winpopup or net send, to a user outside of my LAN based on their IP address.

Is this possible? so far I have only been able to figure out how to send it to different computers within my LAN based on a PC or Domain name.

Surely it can be done in some way with an IP address because I'm sure we have all recieved those annoying spam popup messages that come constantly over the internet. Also note, I do not wish to use this to spam other people, only to send a single message to a user/abuser of my webserver whose IP address I have logged.

Thanks all,

-Erik