Generally, a newsletter is meant to do two tasks: informing people about something or persuading them to do something. For example, a newsletter may inform your clients about your new product or inform them to check out the company's website for the latest information.
Okay, now you've written the proposal. The finish line is in sight, but you're still not quite done. Take some time to make your proposal visually appealing. You might want to incorporate your company logo, use colored borders, or employ special bullet points and fonts. Just make sure that any added graphic touches match your style and the tone of your proposal. Don't forget to spell_check and proofread every page. For the final check, it's a good idea to recruit a proofreader who hasn't read your proposal before. It's way too easy to miss errors in your own work.