Windows Server 2019启用SMTP服务器与M365对接设置匿名发送邮件

Question

服务器Windows Server 2019

Microsoft M365

测试：

Windows Server 2019 启用web服务器IIS、基本身份验证、SMTP服务器

M365 开启 STMP服务和启用基本身份验证。

一些设备不支持TLS协议，所以需要一台中继服务器做邮件转发

问题：

1、在SMTP服务上如何设置匿名发送邮件？

我都是设置M365一个用户邮箱做发件人，然后在设备上添加这个发件人进行发送邮件。是正常可以发送。

我想设置匿名发送。。。请问有方法吗？ 

Answer 1

Hello there,

Yes there are many ways but it is not recommended to do so.

Many SMTP servers check DNS Block Lists before accepting mail and home user IP ranges are often blocked as a matter of policy. Modern SMTP servers frequently also scrutinize the "from" address, checking that the domain is valid, and that the IP address of the sending machine is authorized by that domain to send emails (SPF). Techniques such as greylisting do not outright prevent manually sending mail, but they make the process more onerous by forcing the user to send the same message more than once with a delay in between.

Standard problems to watch out for with SMTP:

Most ISP's block port 25, so you cannot use non-SSL/TLS SMTP except to a local server or in special cases.

GMail's SMTP, as far as I know, only accepts authenticated login for mail transmission.

Hope this resolves your Query !!

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