translation.en: But there's a problem with this, and that is, the email servers also hold the encryption keys, so now you have a really big lock with a key placed right next to it.
translation.zh: 但是，这个方法有一个问题： 加密钥匙也在邮件服务器中。 这就像一把大锁，但钥匙就放在旁边。