Email subject line testing is probably the easiest tactic to directly improve your email campaigns and that is why one of the most profitable tactics you can employ in order to improve the return you are getting from your email marketing activities. The dotMailer team already covered the importance of the subject line testing better than I would ever do so I decided to share some actual testing ideas (or as scientists call it - Hypothesis) which you can easily apply to your next email campaign.
5 Subject Lines Test Ideas
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