A good newsletter should be interesting, informative and useful. It should be well-designed, and contain clear and concise information.
It should be regularly updated, and include new content as well as archived information.
A good newsletter should also be easy to subscribe to. It should have a simple layout that is easy to navigate, and it should include easy-to-follow instructions for subscribing.
Finally, a good newsletter should be affordable, and it should provide a good value for the money spent.