I have a high school friend who apparently wanted to say "hi" to me, so she sent an email through classmates.com. The drawback being that I can't read it without paying for membership, since she is not a paying member. I sent her one back, which she will not be able to read, although the site has kindly informed me that if I were to join, she would be able to read it free of charge. Sweet of them, really.
Screw that. I put my current email address in the subject line of the email.