Preview text is the small line that appears next to the subject in the inbox, and it can shape whether someone opens the email. It works best when it supports the subject by adding a helpful or friendly detail. For example, if the subject says "Your download is ready," the preview text could say "Here's the link you asked for, ready to use." Keeping it clear and natural helps people understand what they will see inside before they open it. It should avoid repeating the subject or sounding too promotional. What type of short preview lines do you think make people more curious when checking their inbox?