终端出现 You have new mail in ... 的解决方法

1.查看待发送的email

使用mail查看，可以看到有email列表及保存电邮的路径。

Mail version 8.1 6/6/93.  Type ? for help.
"/var/mail/xjzhang": 39573 messages 39573 new
>N  1 MAILER-DAEMON@MacBoo  Tue Aug  7 17:58  76/2635  "Undelivered Mail Returned to Sender"
...

2.查看完成后，把邮件删除

sudo rm /var/mail/xjzhang
sudo touch /var/mail/xjzhang