So in other words, it promotes your business and help you sell more and more products because of the trust relation you are building up.

About the content

The goal is to turn potential customers into real customers. Simple but true.

What you write about in, e.g. articles, promotions, etc, should be interesting and informative without getting boring or hyping things up too much. It's important you add your own personality into the mix. This will help you boost the response on whatever you write.

If you got a web store, let them know about new products, discounts on existing products or just some solid information to keep them enticed.

Layout of the newsletter

Your hard work might be eliminated as spam if you are not careful. Many filters reject HTML formats as spam, so it is safe to use the plain text.

Also be consistent in sending your newsletter. If you decided to do it every single week do it every single week. In this way they know when to expect your newsletter and it will give a boost to your response and read rate.

Your newsletter should have proper way of subscribing and unsubscribing.

How to promote your newsletter.

You definitely want people to read your messages right? But what is the correct way to go at it? After all, there are a million and one ways to do it.

Third party mailing lists are also helpful though you have to spend some extra dough on it. If you let the mailing list handle the tough job of finding clients for you, they take care of all the bounced mails, subscriptions and un-subscriptions.

The owners of these lists usually took a lot of time and effort building and maintaining those subscribers. And they allow you, for a small fee, to tap into that list. It will help you focus on more important stuff like creating content for your newsletter.

I would advise, however, to be independent and send them to your own list. This will make you the most money in the longer run and there are enough solid solutions out there to make it happen.

To keep track of all those subscribers, you need to have a constant internet connection. And you need to keep on sending messages to make sure they know who you are and eliminate spam complaints.