When you send me a text message on Where's Tim, I just send an email to my cell phone at myphonenumber@messaging.sprintpcs.com. Turns out that Sprint didn't like that and block messages that came from my mail server. So I switched it to send through a different server.
I wonder why they cared? I guess they saw a lot of traffic coming from the same SMTP server and assumed it was spam.
[Update here]
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