A newsletter’s optimal length is determined by the action you hope the reader will do. More information is needed for greater actions. You only need to provide your reader enough information—a phrase or two—to pique their interest if all you want them to do is click on a link to a blog post. Generally speaking, though, newsletters should be between 200 and 300 words in length. That being said, 20 lines or 200 words should be plenty to tell your tale and be just as effective in converting provided your call to action is a straightforward request.