为什么80%的码农都做不了架构师&＃xff1f;>>> 
发现服务器上的sendmail发出mail失败&＃xff0c;log如下
Jan 8 14:31:01 mail sendmail[4494]: q086Gv5k004489: to&＃61;, delay&＃61;00:14:03, xdelay&＃61;00:00:01, mailer&＃61;esmtp, pri&＃61;295414, relay&＃61;mail.***.cn. [***.100.5.253], dsn&＃61;2.0.0, stat&＃61;Sent (Mail OK has queued by umail smtpd)
Jan 8 14:31:02 mail sendmail[4494]: q084tBuJ004300: to&＃61;, delay&＃61;01:35:51, xdelay&＃61;00:00:01, mailer&＃61;esmtp, pri&＃61;302517, relay&＃61;mail.***.cn. [***.100.5.253], dsn&＃61;2.0.0, stat&＃61;Sent (Mail OK has queued by umail smtpd)
Jan 8 14:31:03 mail sendmail[4494]: q084cjUM004052: to&＃61;, delay&＃61;01:52:18, xdelay&＃61;00:00:01, mailer&＃61;esmtp, pri&＃61;307859, relay&＃61;mail.***.cn. [***.100.5.253], dsn&＃61;4.0.0, stat&＃61;Deferred: 451 SPF failed
Jan 8 14:31:03 mail sendmail[4494]: q085DHDq004373: to&＃61;, delay&＃61;01:17:46, xdelay&＃61;00:00:00, mailer&＃61;esmtp, pri&＃61;313087, relay&＃61;mail.***.cn. [***.100.5.253], dsn&＃61;4.0.0, stat&＃61;Deferred: 451 sorry, server closed
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