This letter is a formal confirmation about the verbal order that we had discussed earlier on (insert the date). I just wanted you to confirm the acceptance that was communicated to you on the said date. As you note, there is an enclosed copy of the purchased order including the terms and all other included conditions of the deal.
We shall expect the delivery of the merchandise on or before the expected date. Unless if there is an objection within the (period of grace) of your receipt of the order.
Thank you,