Good day. I have attached a business proposal that I believe will be of mutual benefit to both of us to this email. Please go through the attached proposal and let me know if you are interested in the project. After reading the proposal, you can email me back on: firstname.lastname@example.org so that we can go over the details together. If for some reasons you are unable to view the attachment, kindly inform me so that I can so that I can resend the proposal in a different format or plain text.