Scalenut has "Catchy Email Subject Lines" generator and would make sense to also have email content generator based on the email headings. Writing a command might be a good option.
Write an email about accepting a proposal.
I am happy to accept your proposal to work with us on the
project. We will develop a new website platform which will be the
basis of our marketing campaign. I am confident that we can meet
the deadlines. Let's schedule a meeting to discuss the details
of this project. I look forward to hearing from you soon.