When you talk about SMS marketing messages, you always talk about it in terms of the mobile device. The term MO message (mobile-originated message) is a message that a subscriber sent from a mobile device into the ExactTarget system. Setting up your system to respond to MO messages is similar to setting up a triggered email: you create content and the system sends it out automatically whenever anyone triggers the message. In the case of SMS, people trigger the message by sending you a keyword in a MO message.
The term MT message (mobile-terminated message) refers to a message that goes out from the ExactTarget system and is received by the subscriber's mobile device. Setting up an MT message is similar to setting up a user-initiated email: you choose the content and select the subscribers, and send the message at the time you choose.
Right now, ExactTarget users with a private short code can set up their system to respond to MO message as well as send MT messages. With the next release, shared short code users will be able to send MT messages as well. Check out the SMS page on our website.
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