我一直在遵循有关如何使用 Digital ocean Droplets 和 Webmin 设置我自己的 SMTP 服务器以进行电子邮件营销的教程，我已经使用 PUtty 安装了 Webmin，分别设置了 DKIM 和 SPF、MX 等。但我使用了一个免费域名来freenom.com设置movattidesignsitaliano.gqSMTP 服务器。
经过测试，我在 Gmail 的垃圾邮件文件夹中看到了它。然后我在 Horde Webmail（碰巧是我的 Office 电子邮件）的垃圾邮件文件夹中也看到了它，但对于 Yahoo 和 Hotmail，我根本没看到它。
检查 Webmail 内部，我看到了类似这样的内容：
This is the mail system at host movattidesignsitaliano.gq.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<[email protected]>: host
hotmail-com.olc.protection.outlook.com[104.47.22.161] said: 550 5.7.1
Unfortunately, messages from [143.198.57.6] weren't sent. Please contact
your Internet service provider since part of their network is on our block
list (S3150). You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors.
[DB8EUR06FT056.eop-eur06.prod.protection.outlook.com] (in reply to MAIL
FROM command)
<[email protected]>: host
hotmail-com.olc.protection.outlook.com[104.47.22.161] said: 550 5.7.1
Unfortunately, messages from [143.198.57.6] weren't sent. Please contact
your Internet service provider since part of their network is on our block
list (S3150). You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors.
[DB8EUR06FT056.eop-eur06.prod.protection.outlook.com] (in reply to MAIL
FROM command)
<[email protected]>: host mta6.am0.yahoodns.net[67.195.204.79] said: 553
5.7.2 [TSS09] All messages from 143.198.57.6 will be permanently deferred;
Retrying will NOT succeed. See
https://postmaster.verizonmedia.com/error-codes (in reply to MAIL FROM
command)
Reporting-MTA: dns; movattidesignsitaliano.gq
X-Postfix-Queue-ID: AFFECC3F07
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Thu, 11 Mar 2021 08:19:51 +0000 (UTC)
Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.7.1
Remote-MTA: dns; hotmail-com.olc.protection.outlook.com
Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [143.198.57.6]
weren't sent. Please contact your Internet service provider since part of
their network is on our block list (S3150). You can also refer your
provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
[DB8EUR06FT056.eop-eur06.prod.protection.outlook.com]
Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.7.1
Remote-MTA: dns; hotmail-com.olc.protection.outlook.com
Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [143.198.57.6]
weren't sent. Please contact your Internet service provider since part of
their network is on our block list (S3150). You can also refer your
provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
[DB8EUR06FT056.eop-eur06.prod.protection.outlook.com]
Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.7.2
Remote-MTA: dns; mta6.am0.yahoodns.net
Diagnostic-Code: smtp; 553 5.7.2 [TSS09] All messages from 143.198.57.6 will be
permanently deferred; Retrying will NOT succeed. See
https://postmaster.verizonmedia.com/error-codes
From Charles Schwab Online
Date Today 09:19
hi man
这种情况已经持续了一段时间了。我似乎没有正确设置什么？
答案1
首先，您不应该使用 Digital Ocean droplet 来发送营销电子邮件。您应该使用 Mailgun、Amazon SES、Postmark 或类似服务。
Digital Oceans 网络在电子邮件方面声誉不佳，其邮件服务器经常被标记为垃圾邮件，因为：
- Digital Ocean 并不努力限制邮件服务器的创建或筛选允许在其网络上运行邮件服务器的人员。
- 人们频繁从他们的网络发起垃圾邮件活动，这导致他们的整个子网被标记。
被标记为垃圾邮件的子网只能由拥有它们的提供商从黑名单中删除。这意味着，与您自己的 IP/邮件服务器被标记不同，您必须让 Digital Ocean 才能完成删除。它们不适用于某些黑名单。
在 Digital Ocean 上运行邮件服务器从来没有这么困难，但后来人们开始滥用它进行群发电子邮件和营销活动。
为此使用适当的服务。