Never, ever write anything without including a "CTA", as marketers call it. This could be as simple as "Buy Now" or "Click Here" on a website or at the bottom of a blog, or as subtle as "87% of dentists recommend..." which implies if the consumer took the same action, they would achieve the same result. (Think about all those beer commercials that imply that you too can be like the most interesting man in the world if you just drink their brand). Instruct the readers on what to do next, overtly or subtly. Lead them to the action you desire them to take.
Do you have a great customer quote that you can include in your e-mail? A brief and convincing quote can add credibility to your campaign. The more real you can make the person to your readers, the better. Including their name, what city or state they live in and even a photo, if it fits your campaign, is a great way to communicate the value of your service.
That’s only if you, for whatever reason, don’t have another person to edit your work. Even with a great spell check, there will be things you miss. Make sure there’s somebody in your organization with great writing and editing chops who can give your work a second set of eyes. Remember that behind every good writer — whether it’s a best-selling author, a Washington Post journalist or a copywriter for a viral marketing campaign — is a great editor.