This feature is only available when sending a text to all active contacts or a group. To test this, add yourself to a group and send to just that group. This does not work with previews or single text messages.

Simply use the (FIRSTNAME) tag in your messages. For example 

Hi, (FIRSTNAME)! Stop in today to get a free soda when you buy a slice of pizza. 

Also, you can use the Optional1, Optional2 and Optional3 fields with these tags: (OPTIONAL1), (OPTIONAL2), (OPTIONAL3).

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