邮件反弹(退信)：发信域被Spamhaus列入黑名单，直接导致退信

比如我给[email protected]发邮件，因hotmail.com引用了Spamhaus的发信域黑名单列表，如果你的发信域被Spamhaus列入黑名单的话，直接导致hotmail无法发送，直接退信。

退信案例如下：
This is the mail system at host us2.outbound.mailhostbox.com.

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

: host
hotmail-com.olc.protection.outlook.com[104.47.70.33] said: 550 5.7.1
Service unavailable, MailFrom domain is listed in Spamhaus. To request
removal from this list see https://www.spamhaus.org/query