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我正在从邮件传递系统获取邮件。我附上了下面的邮件。

---------- Forwarded message ----------
From: Mail Delivery System <Mailer-Daemon@test.com>
Date: Wed, Aug 9, 2017 at 10:00 PM
Subject: Mail delivery failed: returning message to sender
To: info@test.com

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

test@gmail.com
    host alt3.gmail-smtp-in.l.google.com [243.122.66.26]
    SMTP error from remote mail server after RCPT TO:&lt;test@gmail.com&gt;:
    550-5.2.1 The user you are trying to contact is receiving mail at a rate that
    550-5.2.1 prevents additional messages from being delivered. For more
    550-5.2.1 information, please visit
    550 5.2.1  https://support.google.com/mail/?p=ReceivingRatePerm p41si4843565qte.548 - gsmtp
Action: failed
Final-Recipient: test;test@gmail.com
Status: 5.0.0
Remote-MTA: dns; alt3.gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.2.1 The user you are trying to contact is receiving mail at a rate that
550-5.2.1 prevents additional messages from being delivered. For more
550-5.2.1 information, please visit
550 5.2.1 https://support.google.com/mail/?p=ReceivingRatePerm p41si4843565qte.548 - gsmtp

我对此一无所知，任何人都可以帮忙。

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