Requirement
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Implementation
Email Template
Give the template a name, subject, and format.
Create the html. An example below is provided with heavy comments.
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Save your campaign, and then scroll down to the steps. You'll need four steps. While the process appears linear (no branching), the Logic step does contain an _ENDCAMPAIGN_ result, which is essentially a branch in that it marks a recipient as finished at that step.
The Start step is created for you.
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