A business proposal email is a persuasive sales document sent to clients to gain business. Learning how to write an effective business proposal is essential.We've rounded up 4 unique methods for writing proposal submission emails. Plus, we've got email samples for each method. We've put together nine followup email samples to help you get started (you can also grade your email subject lines with our free Subject Line Grader!). We've rounded up our favorite tips for creating and structuring effective formal emails, with helpful examples and templates. We'll outline basic formatting techniques that can be used thoughtfully and strategically to strengthen your proposal. We've collected the top 10 proposal email templates you need to know. First, you'll want to reach out to your client and gather all necessary information about their business and goals. A successful sales proposal can make the difference between winning or losing a sale.