A preheader is a short summary text that follows the subject line when viewing an email from your email client. In many cases, it provides a short summary of the email, and is typically one sentence long.
Preheaders are not supported by all email clients. When not supported, the preheader does not display.
To define the email preheader, follow the steps below:
From the Email designer, add a Structure components to start designing your email.
From the Body settings right pane, click Edit next to the Preheader field to add content.
Add your preheader. You can further personalize it by clicking the Add personalization icon.
From the Edit Personalization window, you can add Content block, Dynamic content or Personalization fields.
Click Validate to check your personalization syntax.
Your preheader is now configured for your email.