发件人： postmaster@winmail.cn
发送时间： 2022-09-06 11:20:06
收件人： demo@winmail.cn
抄送：
主题： failure notice（错误回弹信）
 
Hi. This is the smtp delivery program.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
========================= ============================
您好！

您的邮件不能成功的递送到指定地址。这是一个永久的错误，因此不得不放弃继续递送。
<winmaildemo@gmail.com>, remote server said: 550-5.7.1 [111.140.xxx.xxx  12] Our system has detected that this message is
550-5.7.1_likely_unsolicited mail. To reduce the amount of spam sent to Gmail,
550-5.7.1 this message has been blocked. Please visit
550-5.7.1 http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for
550 5.7.1 more information. mu18si1139639pab.287 - gsmtp/

--- Below this line is a copy of the message.

Received: from hp-spring ([115.206.28.84])
(envelope-sender <demo@winmail.cn>)
by 192.168.1.4 with ESMTP
for <minahan@winmail.cn>; Sat, 06 Sep 2022 11:20:00 +0800
Date: Sat, 6 Sep 2022 11:20:55 +0800
From: "demo" <demo@winmail.cn>
Reply-To: demo@winmail.cn
To: hr@winmail.cn
Cc: "cathy tsai" <winmaildemo@gmail.com>,
 "agnes.fu" <agnsfu@winmail.cn>
Subject: KET sample question to ask in order to prepare the samples
Message-ID: <202209061120555008262@winmail.cn>

• 552-5.7.0 This message was blocked because its content presents a potential
  552-5.7.0 security issue. Please visit http://support.google.com/mail/bin/answe
  552-5.7.0 r.py?answer=6590 to review our message content and attachment content
  552 5.7.0 guidelines. tk9si9998068pac.416 - gsmtp
  退信原因：作为防御潜在病毒的一项安全措施，Gmail 不允许您发送或接受可执行文件（如带有 .exe 后缀名的文件）。可执行文件可能包含有害代码，从而可能导致将恶意软件下载至您的计算机上。此外，Gmail 也不允许发送或接收破坏的文件、无法正常工作的文件。
  处理建议：检查外发邮件的附件是否正常。以下附件不可发送：（压缩后也不行）
  .ade、.adp、.bat、.chm、.cmd、.com、.cpl、 .exe、.hta、.ins、.isp、.jse、.lib、 s.lnk、.mde、.msc、.msp、.mst、.pif、.scr、 .sct、.shb、.sys、.vb、.vbe、.vbs、vxd、.wsc、.wsf、.wsh
  无法发送内含压缩文件的密码保护压缩文件。如有可能，请解压缩所有文件或去掉密码保护。
  您所发送和接收的邮件总大小（包括附件）不得超过 25 兆字节 (MB)
  如果要了解具体情况请到https://support.google.com/mail/answer/6590查看说明。
• 550 5.2.1 The email account that you tried to reach is disabled. u8si12721870pbf.252
  退信原因：收件人的邮箱状态冻结。
  处理建议：联系收件人确认其邮箱状态正常。
  
• 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 http://mail.google.com/support/bin/answer.py?answer=6592 qm4si36139485igc.67
  退信原因：您试图联系的 Gmail 用户在短时间内收到了太多邮件。
  处理建议：请注意，这是暂时性问题，应该很快就会解决。可以等待一段时间再重试发送
  
• 550-5.7.1 [183.63.xxx.xxx 3] Our system has detected an unusual rate of
  550-5.7.1 unsolicited mail originating from your IP address. To protect our
  550-5.7.1 users from spam, mail sent from your IP address has been blocked.
  550-5.7.1 Please visit http://www.google.com/mail/help/bulk_mail.html to review
  550 5.7.1 our Bulk Email Senders Guidelines. hl10si435917vdb.117 - gsmtp)
  退信原因：Gmail认为此邮件为大量群发邮件。可能是广告、推广、会员等类型邮件。
  处理建议：注意向Gmail发信的频率，对方有频率要求，超过频率将无法发信给Gmail。注意外发邮件内容，并且给服务器做好相关的正确的MX记录，IP反向解析，SPF记录，如果要了解Gmail的相关群发说明，可以到https://support.google.com/mail/answer/81126查看。
  
• 550-5.7.1 [176.232.xxx.xxx 11] Our system has detected that this message is
  550-5.7.1 not RFC 2822 compliant. To reduce the amount of spam sent to Gmail,
  550-5.7.1 this message has been blocked. Please review
  550 5.7.1 RFC 2822 specifications for more information. je1si14935522pbb.180 - gsmtp)
  退信原因：邮件内容不符合RFC 2822 标准。
  处理建议：检查邮件源码，发送的邮件不符合相关的RFC标准。也有可能是邮件内容本身敏感词，检查内容重新发送。
  
• 421-4.7.0 [113.106.xxx.xxx 15] Our system has detected an unusual rate of
  421-4.7.0 unsolicited mail originating from your IP address. To protect our
  421-4.7.0 users from spam, mail sent from your IP address has been temporarily
  421-4.7.0 rate limited. Please visit
  421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review our Bulk
  421 4.7.0 Email Senders Guidelines. om6si16848085wjc.30 - gsmtp
  退信原因：Gmail认为此邮件为大量群发邮件。可能是广告、推广、会员等类型邮件。
  处理建议：注意向Gmail发信的频率，对方有频率要求，超过频率将无法发信给Gmail。注意外发邮件内容，并且给服务器做好相关的正确的MX记录，IP反向解析，SPF记录，如果要了解Gmail的相关群发说明，可以到https://support.google.com/mail/answer/81126查看。
  
• 550-5.1.1 The email account that you tried to reach does not exist. Please try
  550-5.1.1 double-checking the recipient's email address for typos or
  550-5.1.1 unnecessary spaces. Learn more at
  550 5.1.1 http://support.google.com/mail/bin/answer.py?answer=6596 hk7si5975086wjc.23 - gsmtp
  退信原因：收件人邮箱地址不存在。
  处理建议：检查收件人地址是否正确，联系对方确认地址正常。如果您确定不存在错误，则相应Gmail地址可能已被禁用、删除或者根本不存在。
  
• 550-5.7.1 [2001:db8:8e3f:xxxx::xx 16] Our system has detected that this
  550-5.7.1 message does not meet IPv6 sending guidelines regarding PTR records
  550-5.7.1 and authentication. Please review
  550-5.7.1 https://support.google.com/mail/?p=ipv6_authentication_error for more
  550 5.7.1 information. bz2si13656083wjc.108 - gsmtp
  退信原因：发件人设置不正规。
  处理建议：没有设置相关IP反向解析，SPF记录，可以先做好相关记录再外发。具体可以查看https://support.google.com/mail/?p=ipv6_authentication_error说明。