The subject is one of the most important components of an email campaign. It is listed in the users inbox in the subject line. Your email campaign will be more successful if the subject is phrased meaningful and attractive.
You can personalize the subject of your emails. Consider using a field from your databank (name, surname, city,..) in your subject and address the user personally.
To do this, simply click on Insert Field and select the appropriate field from your address date base.