" Successful email marketing tactics are spread across the web. But even with ample resources available and advanced email marketing software, mistakes are regularly made. These blunders, however, aren't the blantantly mispelled words in the opening paragraph or the misplaced graphics that feature the wrong promotion. These are the little—and sometimes big—mistakes that are easy to overlook, but when made, could cost you email opens and click-throughs.

To prevent you from erring like everyone else, we asked marketers, startup founders and marketing executives to name the mistake that sticks out most. "

Source :  https://zapier.com/learn/ultimate-guide-to-email-marketing-apps/email-marketing-mistakes/