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So what’s our advice for email subject lines? This is going to sound “stupid simple” to a lot of people, but here goes: Your subject line should (drum roll please): Describe the subject of your email. Yep, that’s it. Always set your subscribers’ expectations during the opt-in process about what kinds of emails they’ll be receiving. Don’t confuse newsletters with promotions. If your email is a newsletter, put the name and issue of the newsletter in your subject line. Because that’s what’s inside. If your email is a special promotion, tell them what’s inside. Either way, just don’t write your subject lines like advertisements. When it comes to email marketing, the best subject lines tell what’s inside, and the worst subject lines sell what’s inside.