We will all go through writing a business letter at least once in our lifetime. It does not matter if you are an employee, an owner, a stay_at_home mom (or dad) that has her own business at home; we all have to go through writing it. It cannot be avoided!
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")