If you are writing to someone who has a doctorate or medical degree, use the abbreviated form: "Dr." However, for other titles, such as professor, judge, rabbi, etc., write out the full title and capitalize it. For example, your salutation in a letter to a judge would be, "Dear Judge Barnard." Or, if your correspondence was with a rabbi, you might write, "Dear Rabbi Williams."
The Complimentary Close: It is a humble way of ending a letter. It is written in accordance with the salutation. The most generally used complimentary close are Yours faithfully, Yours sincerely, and Thanks & Regards. Signature and Writer’s Identification: It includes signature, name, and designation of the sender. It can also include other details like contact number, address etc. The signature is handwritten just above the name of the sender. Enclosures: Enclosures show the documents attached to the letter. The documents can be anything like cheque, draft, bills, receipts, invoices etc. It is listed one by one. Copy Circulation: It is needed when the copies of the letter are sent to other persons. It is denoted as C.C. PostScript: The sender can mention it when he wants to add something other than the message in the body of the letter. It is written as P.S.