title: Force SMS messages sent from static email address to use the same number (AT&T example)
body: <p>This specific example is using AT&amp;T as the carrier of the receiver.  </p>
  
  <p>When sending SMS messages to clients via their carrier email address (1234567890@txt.att.net) from a static email address, the messages arrive on the phone from a number in the format of <code>1 (400) 000-244</code>. Every time a new SMS message is sent, that number changes slightly. This causes phones, such as the iPhone, from properly threading the SMS messages that are coming from the same source email address.</p>
  
  <p>Basic research shows that this has something to do with how AT&amp;T's gateway handles turning emails into SMS messages. We've also looked at and decided that <a href="http://www.usshortcodes.com/csc_obtain_a_csc.html" rel="nofollow">Common Short Codes (CSC)</a> are not worth $1000 per month to purchase, so this is not an option for us.</p>
  
  <p>Does anyone know of another way around this limitation in which it would be possible to force all SMS messages from the same source email to appear that way on the phone so that they are threaded correctly?</p>
  
  <p>In our configuration, the emails are going out via SMTP using the PHP <a href="http://pear.php.net/package/Mail_Mime" rel="nofollow">PEAR Mail_Mime</a> package. We're really looking for a way we can do it on our end without the purchase of a shared or dedicated CSC.</p>