Short means about 50 percent less than you write for a printed newsletter. Each article should be about two page-downs at the most with a maximum sentence length of 15 to 20 words, maximum paragraph length of five sentences, and a maximum article length of four paragraphs. Remember to write in a conversational tone. Let your personality show through and readers will more likely invest their time reading what you have to say. Remember to use lots of bullet points and numbered lists.
Lists are easy to scan and they help the reader absorb each item one at a time.
Remember to limit each article to a single concept. Add resources such as web sites where longer articles or more information can be found. Remember that email newsletters are easily forwarded. Remember that email newsletters only cost you your time. Send your newsletter out consistently and reap the marketing rewards of regular contact.