While you’re able to update your email’s subject line, preheader, From name, and From and Reply-to email addresses while scheduling your email to send, you can also update this information separately. And if you’re having trouble coming up with an enticing subject line or preheader, you can choose one of our recommended options.
On Android, tap the
Menu icon and select Campaigns. 
On iOS, tap Campaigns from the navigation menu at the bottom of the screen.

On Android and on iOS complete the following steps to edit the email header:





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