Last time I checked, I could not find a way to block spam text messages through my AT&T account. Today, I received another spam text message, so I decided to look around again, and I was delighted to discover that AT&T now provides a way to selectively block text messages. I have no idea when AT&T started providing this option - I never received any kind of announcement of it and I havent seen anyone blogging about it, so I think it is a little known, probably recently released, option.
Now you can login to a Messaging Preferences page and set options to block text messages. Youll have to register your phone number and a password before you can log in (even if you are already logged into your AT&T account). After you register, AT&T will text message a 5 digit registration number to your cell phone and then you can complete your registration and start changing options.
Your choices are to:
Block text messages sent as email (from email accounts)
Block all multimedia messages send as email
Block all messages sent from mobile numbers
Block messages sent from specific email accounts or domains
Allow all messages sent from specific email accounts or domains