What is an email pre-header?

A preheader is the the short summary text that follows the subject line when an email is viewed in the inbox. Many mobile, desktop and web email clients provide them to tip you off on what the email contains, before you open it. Here’s an example in Gmail:


Generally this line of text is borrowed from the first text found in the email campaign. On mobile clients in particular, the preheader can mean the difference between someone opening your email and archiving it.

You will generally want it to be something meaningful. The highlighted row below shows an example of a preheader:   


If your email campaign is not displaying a useful preheader by default, you can specify your preheader text when publishing your document.

The email preheader field is highlighted below:

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