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当给‘demo@live.co.uk’发邮件时，以下是微软邮件服务器发过来的错误日志"demo@live.co.uk dropped hardfail 5.7.1 Unfortunately, messages from [159.135.234.187] weren't sent. Please contact your Internet service provider since part of their network is on our block list (AS3140). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors."
可以看出我们的邮件服务器IP被列入了黑名单，去掉步骤:
1. 去这里申诉：
https://support.microsoft.com/en-us/getsupport?oaspworkflow=start_1.0.0.0&wfname=capsub&productkey=edfsmsbl3&ccsid=635688189955348624&wa=wsignin1.0
填写完表单，等待即可
2. 了解微软的SNDS并设置? https://postmaster.live.com/snds/index.aspx.
3. 联系你的ESP（邮件提供服务商）给您的出口IP设置反向DNS
如mailgun(ESP) 给我们提供的rDNS A m234-187.yourdomain.com --→ 159.135.xxx.xxx
做好以上3步，可以接触微软的限制。当然了还是要维护好自己的发送信誉。
做完了‘申诉’后,官方回复的邮件如下：
Dear xxx
We have completed reviewing the IP(s) you submitted. The following table contains the results of our investigation.
Conditionally mitigated
159.135.xxx.xxx
Our investigation has determined that the above IP(s) qualify for conditional mitigation. These IP(s) have been unblocked, but may be subject to low daily email limits until they have established a good reputation.
Please note that mitigating this issue does not guarantee that your email will be delivered to a user’s inbox.
Ongoing complaints from users will result in removal of the mitigation.
Mitigation may take 24 - 48 hours to replicate completely throughout our system.
If you feel your issue is not yet resolved, please reply to this email and one of our support team members will contact you for further investigation.
Regardless of the deliverability status, Outlook.com recommends that all senders join two free programs that provide visibility into the Outlook.com traffic on your sending IP(s), the sending IP reputation with Outlook.com and the Outlook.com user complaint rates.
Junk Email Reporting program (JMRP) When an Outlook.com user marks an email as "junk", senders enrolled in this program get a copy of the mail forwarded to the email address of their choice. It allows senders to see which mails are being marked as junk and to identify mail traffic you did not intend to send. To join, please visit http://support.msn.com/eform.aspx?productKey=edfsjmrpp&page=support_home_options_form_byemail&ct=eformts.
Smart Network Data Services program (SNDS). This program allows you to monitor the ‘health’ and reputation of your registered IPs by providing data about traffic such as mail volume and complaint rates seen originating from your IPs. To register, please visit http://postmaster.live.com/snds/.
There is no silver bullet to maintaining or improving good IP reputation, but these programs help you proactively manage your email eco-system to help better ensure deliverability to Outlook.com users.
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