After you’ve created an Email Template, you can verify the merge fields by sending a test email to a test email address, validating how the actual email looks.
Go to your email template that you would like to test and click 'Send Test and Verify Merge Field.' You see the following options on a window, "Preview the template with the following records:"
View and Edit Email Templates in Salesforce Classic
Use the Salesforce Merge Language in Classic Email Templates
Lightning Email Action
Email Template
Video - Creating Email Templates in Lightning Experience
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