I read somewhere that somewhere there is something you can use so that you may send e-mails, but to the recipient the sender address shows as another e-mail. For example, you could send an e-mail saying that the 'user' is in trouble and must send their Password, and it would actually appear as if it was from the actual website's e-mail.

Your thinking of Email Spoofing I'm pretty sure.

Defiently email spoofing.

http://en.wikipedia.org/wiki/E-mail_spoofing

Here's how:
http://www.totse.com/en/hack/underst...ing173500.html

LMAO i love spoofing, do it all the time to mess with teachers. Then i got lazy so i wrote a VB app to do it easy.

Ok...lol. (Woah! Thats old!)
I found some website that you just typed all the email, message and subject and send it...It was some dude from Nebraska...

meh, you can also fake the email and have the reply email be your own......or oen you make up.....