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What's the Difference Between HML and SML Merge Languages?
Lightning email templates now use the Handlebars Merge Language.

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Lightning email templates now use the Handlebars Merge Language.
| Available in: Lightning Experience |
| Available in: All Editions |
List email not available in: Personal, Contact Manager, and Group Editions |
In Summer ‘18, we introduced the Handlebars Merge Language (HML) for email templates in Lightning Experience. If your email template has merge fields with three curly braces ({{{), you’re using an HML email template. If the merge fields have one curly brace ({), or an exclamation mark (!), you’re using a SML (Salesforce Merge Language) email template. Lightning templates created since Summer ‘18 are HML email templates.
An email template can contain one type of merge field language only.
New abilities include:

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