mail 450 Requested mail action not taken: too much reci

今天用sendmail给139邮箱发邮件，总是发不出去。
用mailq查看时，显示

/var/spool/mqueue (1 request)
-----Q-ID----- --Size-- -----Q-Time----- ------------Sender/Recipient-----------
o5T32lg4001700 5 Tue Jun 29 11:02 <[email protected]>
(Deferred: 450 Requested mail action not taken: too much reci)
<[email protected]>
Total requests: 1

后来从google上搜到一篇文章，具体解决办法是这样的：
vi /etc/mail/sendmail.cf
找到
#Dj$w.Foo.COM
＃我添加了如下，这个格式自己定吧，我主要是让自己的发件人里包含了sysMonitor.com
Dj$w.sysMonitor.com

然后重启sendmail，发邮件成功。<!--++ plugin_code qcomic begin--> <!--++ plugin_code qcomic end-->