Article first published October 2014, updated May 2019 Are you A/B testing your email subject lines? If so, you’re taking a step in the right direction toward better results from your email marketing. However, if you’re just creating two different subject lines at random for each campaign, then you may not be getting the best results. CoSchedule—a startup that uses Campaign Monitor to send their popular email newsletter, The Content Marketing Update—recently wrote about how they systematically A/B test email subject…