A/B testing the subject of an email campaign is always useful in order to understand your subscribers’ preferences and improve the open rates and overall results of your campaigns. Here some test you can run:

  • Personalization in the subject with the first name of your subscribers (provided you always have one or you can use a default value) vs an impersonal subject
  • Use / don’t use emoji 
  • A subject that anticipates the content vs a “repetitive but recognizable” subject (eg. My Topic Bullettin #N)

A smart tip I got from a colleague: write down several versions of the subject, A/B test the first two or three, then use the winner and the remaining versions to create an A/B test campaign for those who didn’t open the first one.