If you want to sent her something for her eyes only, hide the message in a jpeg file use a steganography program. there's a bunch of free ones out there. maybe this is what you mean by "bind". other than that it's like keezel said.

as far as netcat goes what os are you using and did you get a version made for it? what happens when you tupe NC at the command prompt?

+=+=+=+=+=+=+=+=+=+=+
Your gf's dad reads her email?? Holy crap! Unless he's pretty adept at using computers she could just have another (secret) email account...
=+=+=+=+=+=+=+=+=+=+=

maybe this girl has respect for her father who obviously cares allot about her to take the time to watch over her. This type of story is refreshing compared to those of parents that blame the internet or socity in general for their shortcomings as parents when something bad happens.