Don't use generic salutation such as to whom so ever it may concern or dear sir / madam. (bestcoverletters.com)
This letter should be send to the appropriate person, avoid mentioning generic salutation such as to whomsoever it may concern. (bestcoverletters.com)
Letters that begin with the name of HR manager have greater chances of being taken seriously as compared to those beginning with generic salutation like Dear Sir / Madam. (coverlettersandresume.com)