你是不是要表达”如果你没有收到那封信并且对信的内容感兴趣的话,我非常乐意重新给你发一封.“
是的话,那就应该是：”If you have not received that letter,and are interested in its content ,I am very happy to send it again.“(这是电子邮件)
如果是纸质信封的话,就应该是”If you have not received that letter,and are interested in its content ,I am very happy to send another with the same content.“