This is an excellent way to grow your business using your mailing list (which I trust you are constantly building). However, you have to accept that there are people who'll read your newsletter and there are those who won't.
It does, however, help to build brand recognition and keeps your name in front of your existing and potential customers. People are also more likely to read a newsletter than a sales letter because they see it as less threatening.
A newsletter lets customer know that:
You are an expert in your field You are prepared to give them lots of free advice, tips and ideas You have some new products or services You have a sale or a promotion coming up You understand customer's industry and their problems You are a human organisation with lots of lovely people You are an organisation to be trusted You provide great customer service to other organisations
You can use your newsletter to build a relationship with your customer and you can also use it as a selling tool.
If you only use it to sell then your customers may become fed up with it and dump it quickly. However, if you give them something FREE, such as - tips, advice, ideas and information, then they're more likely to stay with you and keep reading.