“Yours sincerely,” “Yours faithfully,” and “Yours truly,” in the US formal letters Hello, everyone. In the UK formal letters, there is a difference between Yours faithfully and Yours sincerely, as shown in the following BBC's web page: http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv245.shtml When the recipient’s name is not known, the opening is Dear Sir or Dear Madam, and the closing is Yours faithfully. When the recipient’s name is known, the opening is Dear Mr Jenkins or Dear Ms Hopkins, and the closing is Yours sincerely. ***** I would like to know the usages in the US formal letters. When the recipient’s name is not known, what closing should I use? The above BBC’s web page seems to suggest “Yours faithfully,” and “Yours truly,”. Are both of them suitable? When the recipient’s name is known, what closing should I use? The above BBC’s web page seems to suggest “Yours sincerely,” “Sincerely yours,” and “Sincerely,”. Are all of them suitable? Thank you very much for reading my questions.