How the email subject is written in the email campaign is up to you.

You may want the subject line and the pre-header to be AI-generated, summarizing the email body so that it is relevant and every email subject is completely unique.

If you prefer the old-fashioned usual placeholder style then you can go ahead with that choosing ‘No’ and writing in the subject line you would like, along with the placeholders, such as {first_name}, would you like to buy our widgets…