So as a content writing exercise there is a lot that is required to be the part of newsletter writing. First and the most important the content of the newsletter should be engaging and interesting to catch the attention of its reader and most effectively promoting the service or business it is talking about.
The weekly content should not be repetitive and boring instead should have fresh and novel content all the time as a part of new letter sending exercise. A newsletter is an extension to business ideas and there very high level of professionalism should be included in it as it talks about the reputation of the business. It should be filled with appealing articles without much grammatical mistake and errors. It should be well designed. If it is hard copy then you must use high-quality paper for the newsletter.
The language of the newsletter should be filled with personal touch and interpersonal appeal in the content of the newsletter. Sometimes do also provide content writing pitches with free offers and important evaluations and above all your newsletter should be consistent and regular in delivery and should not be trapped into spam filter.