我发现我的服务器有很多电子邮件被退回……退回信息表明 IP 没有设置反向 DNS，但当我在本地机器上查询时，我可以看到有效的 rDNS 记录。我知道我至少在四天前设置了 rDNS 记录，所以我确信任何 TTL 都已过期。这可能是什么原因造成的？我该如何排除故障？
服务器的IP是：209.59.186.119
以下是一封示例退回邮件，其中删除了电子邮件地址：
[email protected]
SMTP error from remote mail server after initial connection:
host cdptpa-smtpin01.mail.rr.com [75.180.132.243]:
554 5.7.1 - Connection refused. IP name lookup failed for 209.59.186.119
------ This is a copy of the message, including all the headers. ------
------ The body of the message is 3307201 characters long; only the first
------ 106496 or so are included here.
Return-path:
Received: from mail-px0-f174.google.com ([209.85.212.174])
by webserver01.venuecom.com with esmtpsa (TLSv1:RC4-SHA:128)
(Exim 4.69)
(envelope-from )
id 1Q1dLe-0004yE-VA
for [email protected]; Mon, 21 Mar 2011 07:32:36 -0400
Received: by pxi15 with SMTP id 15so1073240pxi.5
for ; Mon, 21 Mar 2011 04:32:36 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.142.250.5 with SMTP id x5mr2803872wfh.440.
1300707156399; Mon,
21 Mar 2011 04:32:36 -0700 (PDT)
Received: by 10.142.88.2 with HTTP; Mon, 21 Mar 2011 04:32:36 -0700 (PDT)
Date: Mon, 21 Mar 2011 07:32:36 -0400
Message-ID:
Subject: invoice for reprint/final proof
From: aaaa bbbbbb
To: [email protected]
Content-Type: multipart/mixed; boundary=001636ed678203ac8b049efc7ca1
Sent from my iPad
答案1
您的 PTR 地址有效。如果无效，RR 将返回 421 错误，而不是 554。您的 DNS 对我来说似乎没问题（在此报告）
我认为 554 错误意味着您的电子邮件服务器在连接时需要正确标识自己为相关主机名 (webserver01.venuecom.com)。例如，它应该用“EHLO webserver01.venuecom.com”来问候 RR 服务器
更多信息请点击这里：http://security.rr.com/mail_blocks.htm