Name (Optional but adds value to the letter if you are resourceful as to find out the name of the person who is recruiting). Title, Company, Address, City, State, Zip Code _ Salutation _ Dear Mr. /Ms. Last Name, (It is recommended that the recruiting person's name is sourced and mentioned instead of opting for Dear Sir/Madam. But do not use "To whom it may concern")
There are a lot of business letter formats that can be used. However, the block format is the simplest and the most widely used amongst all of them. Just keep the following things in mind since they are quite common in all of them: the return address of the letter writer should be indicated, the date of the letter, the complete name, title and address of the recipient should be indicated and the appropriate salutation with a colon should be used. Do not forget that the body of the letter should be short. Businessmen especially the owners do not have the time to read a long letter. In fact, it should not have more than 4 paragraphs. Actually there is a preformatted business letter format that you can always use to help you out. It will make sure that your letter has the right space in between paragraphs, the right margins and size of the indentation and even the right font and its size. It is important that use the correct business letter format because of the impression that it will give your recipient about you and your business.