How can you preview a message for a given subscriber?

Sometimes, seeing a preview of the email contents for a specific recipient can be a great way to spot check any dynamic content in the email (template variables, etc.).

In order to do it, first click on the Test icon:

Then type to search for a subscriber:

Then once you click on a subscriber, you'll see the preview refreshed with the contents for that subscriber:

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Here's a GIF that shows the whole process: