When you get something to end up at a destination, you send it. You can send an email, send a package, or even send a student to the dean's office.
You can send a message in a letter or in an email, or you can send a rocket up into the air. You can also send a person somewhere: "My parents used to send me to camp every summer." If you kick someone out, you send them packing: "If my roommate whistles that song one more time, I swear I'll send her packing." And if you're really irritated, you might even send them flying, or knock them down.