Annette Promes says, “Remember back in January, when we asked you to help us run an experiment with the Marketing Experiments Blog testing the effectiveness of different  email subject lines? The results are in, and we have a subject line winner! We’ll talk about the test methodology and the winning submission, but before getting to that, I wanted to go over some of the common pitfalls and danger zones when it comes to email subject line testing (and, really, testing in general).

Boundary #1: Make sure you’re measuring the right thing

Generally speaking, the impact that email subject lines have on the performance of an email campaign is concentrated on open rate; more effective and intriguing subject lines drive more opens”.

Danger Zones: 4 Things You Need to Know when Testing Emails

MOZ Blog

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