We've rounded up 4 unique methods for writing proposal submission emails. Plus, we've got email samples for each method.We've collected the top 10 proposal email templates you need to know. 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. Learn how to craft an effective business proposal email with our comprehensive guide. Popping the question with a sales proposal? Use these 12 email templates to make sure you're persuasive enough to seal the deal. In this article, I'll walk you through how to write an email proposal and we'll go over some samples, from different industries, you can gain inspiration from. A business proposal might be sent after a potential client has agreed to review the terms in a sales transaction.