If you're not doing 20-30% of your business through email marketing in your business. There's probably something wrong. Sales are the lifeblood of any business.

How I write emails:

While selling a product or service by mail I ensure, I'm an expert on the subject or have learned enough to be able to effectively communicate the product. This makes a dramatic difference in my ability to communicate my thoughts. 

Check out in proof how I added value with the email to readers rather than just selling the service.