You must set a preheader text greater than 30 characters long. This is because preheader text is inevitable for any type of email. If you do not set a custom preheader or provide one too short to meet the 30-character minimum, email systems will start populating the preheader with email content. To avoid that happening, you should always set a preheader of at least 30 characters. The closer it is to the 55-character mobile maximum, the better.
Is the short preheader text I use in my email campaign getting automatically populated?
Last update: March 24, 2024