If you don’t know the name of the person you are writing to, start business emails with either of the following:如果你不知道邮件是写给谁的,商务信函可以用下面任意一种方式开头:Dear Sir,/Dear Madam,尊敬的先生,/尊敬的女士,Dear Madame, is wrong.“亲爱的夫人”这种写法是错误的If you don’t know whether you’re writing to a man or a woman use:如果你不知道是写给先生还是女士,可以写:Dear Sir or Madam,尊敬的先生或女士,It is not usual to start an email To whom it may concern. This should be reserved for letters of reference or similar communications when the recipient is an unknown third party.以“致相关人士”开头并不常见。这种用法一般用在推荐信或与其相似的交流中,收件人是不了解的第三方。