Snippets are reusable blocks of rich text and graphics that you can use in your emails and landing pages.
You cannot embed any Marketo email syntaxin snippets; it will not work in an email. Snippets should just be body content (HTML + TEXT).
Find your email, select it and click Edit Draft.
Select the editable area you want to convert to a snippet, click the gear icon and select Replace with Snippet.
Select the snippet of your choice and click Save.
Only approved snippets appear in the drop-down.
Each time you update and approve your snippet, the changes will be reflected in the email. The email will be drafted unless you approve the snippet with No-Draft.
This is a quick and easy way to re-use dynamic content.