一切运行正常，DNS 或电子邮件服务器设置均未发生任何变化。然后，当某些用户（并非全部）发送电子邮件时，我们收到以下错误（某些用户和域名以及 IP 已更改）。
这仅发生在某些电子邮件用户身上。
De: MAILER-DAEMON [mailto:MAILER-DAEMON] Enviado el: lunes, 25 de junio de 2012 01:49 p.m.
Para: [email protected]
Asunto: Undelivered Mail Returned to Sender
This is the mail system at host mail182-ch112-RR.bigfish.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
<virgilio@sent_to_domain.com>: host
zsca-138961-mail2.customer.somethingbridge.com[156.111.222.16] said:
554-Transaction failed (id=4FE8B30610BE0008), maximum 8 recipients listed
below: 554-Address:virgilio@sent_to_domain.com Server:999.551.11.130
Command:EODT Error:554 5.7.1 Message refused by DNSBL check.
bl.spamcop.net
/ 555.111.2.52 This email has been rejected. The email message was
detected as spam 554 Transaction failed (in reply to end of DATA command)
错误的根源可能是什么？
答案1
您的 IP 似乎在黑名单服务器中...请在此处检查您的 IP。
回复信息里是这么说的...
EODT 错误：554 5.7.1 DNSBL 检查拒绝消息。
希望这可以帮助。
平四郎
答案2
可能的情况：
IP has been included in a Real-Time Blacklist due to there is Spam coming from your Domain.
You Domain/IP has been blacklisted by the recipient.
设备正在扫描出站垃圾邮件，并且垃圾邮件过滤器已更新。
遵循 DNS 记录上的 SMTP 验证的标准建议：实施反向 DNS 和发件人策略框架。
确保安装并更新本地防病毒软件，确保您的内部网络不受损害。
确保您的防火墙仅允许反垃圾邮件或电子邮件服务器在端口 25 上进行连接。