现在这是一个相当奇怪的问题，来自任何 hotmail 地址的电子邮件都会被我们的一个域名退回。
首先，我可以保证这不是垃圾邮件过滤器的问题，因为肯定没有保留任何内容，而且垃圾邮件过滤器也没有电子邮件到达的记录。其次，我可以向您保证来自所有其他域的电子邮件都可以顺利通过。第三，我很满意所有 DNS 记录都已正确设置，相关域的 MX 记录明确指向我们的邮件服务器。
我看到一些旧的报告类似的事情发生，其要点是 Hotmail 尝试将邮件发送到托管在域的 a-name 记录上的服务器，而不是 mx-record 上。如果它在端口 25 上找到服务，那么它将尝试在那里进行发送。如果没有，那么它将“回退”并最终查看 mx 记录。有人能确认这种奇怪的设置是否仍在发生吗？
有人遇到过类似的情况吗？
还有什么想法我应该检查什么来确保电子邮件传递到正确的服务器？
谢谢你的帮助，罗布
电子邮件标头
x-store-info:D6taffyBScEUZsL+ZXbbDvsjG9szfvD7
Authentication-Results: hotmail.com; sender-id=pass [email protected]; dkim=none header.d=mail.hotmail.com; x-hmca=pass
X-SID-PRA: [email protected]
X-SID-Result: Pass
X-DKIM-Result: None
X-AUTH-Result: PASS
X-Message-Delivery: Vj0xLjE7RD0wO0dEPTA7U0NMPTk7bD0x
X-Message-Info: AuEzbeVr9u5fkDpn2vR5iCu5wb6HBeY4iruBjnutBzpStnUabbM/X3OHG1tkHI7a3kMiU15mwZkdItk0fkPUd26iJME4hbgAR+RCB0ejIvg=
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Wed, 23 May 2012 02:54:43 -0700
From: [email protected]
To: [email protected]
Date: Wed, 23 May 2012 02:54:43 -0700
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="9B095B5ADSN=_01CD299C0888E07C001CA7A1blu0?omc3?s1.blu"
X-DSNContext: 7ce717b1 - 1196 - 00000002 - 00000000
Message-ID: <[email protected]>
Subject: Delivery Status Notification (Failure)
Return-Path: <>
X-OriginalArrivalTime: 23 May 2012 09:54:43.0474 (UTC) FILETIME=[140FC720:01CD38CA]
This is a MIME-formatted message.
Portions of this message may be unreadable without a MIME-capable mail program.
--9B095B5ADSN=_01CD299C0888E07C001CA7A1blu0?omc3?s1.blu
Content-Type: text/plain; charset=unicode-1-1-utf-7
This is an automatically generated Delivery Status Notification.
Delivery to the following recipients failed.
#################@##########
--9B095B5ADSN=_01CD299C0888E07C001CA7A1blu0?omc3?s1.blu
Content-Type: message/delivery-status
Reporting-MTA: dns;blu0-omc3-s1.blu0.hotmail.com
Received-From-MTA: dns;BLU161-W65
Arrival-Date: Wed, 23 May 2012 02:54:38 -0700
Final-Recipient: rfc822;################@##############
Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;550 relaying mail to ################# is not allowed
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Wed, 23 May 2012 02:54:38 -0700
Message-ID: <[email protected]>
Return-Path: [email protected]
Content-Type: multipart/alternative;
boundary="_517b36bc-f50e-4056-81ff-c55f93271170_"
X-Originating-IP: [82.33.204.39]
From: R F <[email protected]>
To: <##############@###############>
Subject: Testing ############## emails
Date: Wed, 23 May 2012 10:54:37 +0100
Importance: Normal
MIME-Version: 1.0
X-OriginalArrivalTime: 23 May 2012 09:54:38.0360 (UTC) FILETIME=[11037180:01CD38CA]
--_517b36bc-f50e-4056-81ff-c55f93271170_
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
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答案1
看起来 Hotmail 似乎很聪明，喜欢以相反的优先级顺序检查 MX 记录。看来我们的备份-备份-备份-备份 mx 记录（优先级 40）混淆了问题。我们拭目以待此事如何进展……
更新
多年后，它仍然运转良好。教训：与 M$ 相关的任何事情都可能涉及有缺陷的逻辑。