Only send email if you have something to say. This one seems obvious, but too many companies start email newsletters with no plan and nothing to say. Email is simply a way to publish content—the content itself has to come first. Before starting a newsletter, make sure it's a sustainable commitment that will help you achieve your business goals. Otherwise, you'll be wasting your subscribers' time and your own time. Ask yourself: What's the goal for this kind of communication? What do we have to say? How will we measure success? Send thoughtful newsletters, and keep the focus on your company's message.
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Know your spam rules. A lot of innocent people send spam because they didn't know any better. Read up on the CAN-SPAM act to avoid any trouble. Put simply, you're allowed to send bulk email only to people who specifically asked to be on your mailing list. If you collected email addresses for a lunch giveaway or an event invitation, then you don't have permission to send marketing emails unless you made that clear at signup. Include an obvious unsubscribe link in every email, and don't forget to remind subscribers how they got on your list in the first place.