SPF failed

发现服务器上的sendmail发出mail失败,log如下

Jan 8 14:31:01 mail sendmail[4494]: q086Gv5k004489: to=<wangjian1@***.cn>, delay=00:14:03, xdelay=00:00:01, mailer=esmtp, pri=295414, relay=mail.***.cn. [***.100.5.253], dsn=2.0.0, stat=Sent (Mail OK has queued by umail smtpd)

Jan 8 14:31:02 mail sendmail[4494]: q084tBuJ004300: to=<wangjian1@***.cn>, delay=01:35:51, xdelay=00:00:01, mailer=esmtp, pri=302517, relay=mail.***.cn. [***.100.5.253], dsn=2.0.0, stat=Sent (Mail OK has queued by umail smtpd)

Jan 8 14:31:03 mail sendmail[4494]: q084cjUM004052: to=<wangjian1@***.cn>, delay=01:52:18, xdelay=00:00:01, mailer=esmtp, pri=307859, relay=mail.***.cn. [***.100.5.253], dsn=4.0.0, stat=Deferred: 451 SPF failed

Jan 8 14:31:03 mail sendmail[4494]: q085DHDq004373: to=<wangjian1@***.cn>, delay=01:17:46, xdelay=00:00:00, mailer=esmtp, pri=313087, relay=mail.***.cn. [***.100.5.253], dsn=4.0.0, stat=Deferred: 451 sorry, server closed

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