Order letter. An order letter orders merchandise by email, are used by individuals and small busineses.
An order letter usually consists of three paragraphs
First. You state that you wish to make an order
Second. You write your order.
Third. You include the method of payment, delivery date, and shipping instructios.
An order letter shoud be addressed to the person responsible for the order, include all the terms and conditions agreed, since it's purely an official letter, there is noneed to used too many adjectives.
Quotation letters. A latter of quotation is any latter writen in reference to the price o a service or product.
Because monely is likely to be exchanged it is important for both parties to be clear about the service.
These letters should be concise and very specific to avoid confusions.
This could range frm a customer or client requesting or accepting a quote.