In 1928 H. W. Fowler listed these phrases and their uses: Yours faithfully (to unknown person on business) Yours truly (to slight acquaintance) Yours very truly (ceremonious but cordial) Yours sincerely (in invitations and friendly but not intimate letters) With slight variations between British and American usage, these forms are still in use. If you … Continue reading Yours faithfully or Yours sincerely?