You've got to decide whether you want to be taken seriously as a crusty professional with a traditional image to uphold or whether to condescend in ways that reach people on their levels. Ignore rules of writing and layout that help people read and understand. It'll do your readers good because they need the intellectual challenge, and it will reinforce that professional distance that is so important. Besides, explaining things in plain English is condescending. Make most of you sentences at least 4-5 lines long.
Simple sentences are for simple minds.
Don't offer e-mail or website versions of your newsletter. People want to accumulate paper while getting it and reading it on your schedule. Don't indent any paragraphs, and ignore the studies that show that right justification makes reading more difficult. And, incidentally, use sans serif type for the body of your newsletter if you want to make it harder to read. You're not publishing it for children.