My friend just got a Samsung SYNC. When I text message her I get a reply that looks like an automatic reply that reads SMS Message. This wouldn't be a problem except we have limited text plans, so each time I send her one it's as if she replies. We're both getting charged for one (her for sending, me for receiving). How can this be stopped so I don't get an "auto reply" for each text I send and she isn't billed for sending one?

I'm sending them via e-mail (example: 1234567890@txt.att.net)