linux-kernel - patch mail rejected by vger.kernel.org

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Date:	Thu, 11 Aug 2016 10:08:00 +0800 (GMT+08:00)
From:	"Zhouyi Zhou" <yizhouzhou@....ac.cn>
To:	linux-kernel@...r.kernel.org
Subject: patch mail rejected by vger.kernel.org

Hi,
  Yesterday, I cced 5 patches to linux-kernel@...r.kernel.org using send-email, but all of them were
rejected by mail server at vger.kernel.org as follows: 
  "Dear yizhouzhou@....ac.cn, Your message to linux-kernel@...r.kernel.org was rejected by the recipient domain. The error that the other server returned was: " SMTP error, RCPT TO: 451 4.7.1 Hello [159.226.251.20], for recipient address <linux-kernel@...r.kernel.org> the policy analysis reported: zpostgrey: connect: Connection refused". Your original message is included as attachment."
  I have successfully posted to linux-kernel@...r.kernel.org previously. And maintainers have received my patch
correctly yesterday. Do you know what is going on?

Many thanks