By convention, formal letters in English commence with the salutation "Dear" followed by the name or title of the recipient. If the name or title of the recipient is unknown, then it is conventional to write "Dear Sir," or "Dear Madam," or where the sex of the recipient is also unknown, "Dear Sir/Madam," or "Dear Sir or Madam" is used. In other forms of written communication (such as fax or email), or in informal messages the salutation is often absent or replaced with a personal variant.