我看到很多电子邮件从我的服务器弹起…反弹消息表明，IP没有反向DNS设置，但我可以看到有效的rDNSlogging，当我在本地计算机上查询它。 我知道我至less在四天前设置了rDNSlogging，所以我相信任何TTL都会过期。 有什么可能导致这个问题，我该如何排除故障？
服务器的IP是：209.59.186.119
以下是一个退回消息示例，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 您的PTR地址有效。 如果没有，RR会返回421错误，而不是554.你的DNS似乎对我来说很好（ 报告在这里 ）
我相信，554错误意味着您的电子邮件服务器在连接时需要正确地将自己标识为有问题的主机名（webserver01.venuecom.com）。 例如，它应该使用“EHLO webserver01.venuecom.com”来问候RR服务器
更多信息在这里： http : //security.rr.com/mail_blocks.htm