從 Hotmail 到我們域的電子郵件總是被退回

現在這是一個相當奇怪的問題，來自任何 hotmail 地址的電子郵件被我們的一個域退回。

首先，我可以保證這不是垃圾郵件過濾器問題，因為肯定沒有任何東西被保留，此外，垃圾郵件過濾器沒有任何電子郵件的記錄。其次，我可以向您保證，來自所有其他域的電子郵件都可以正常通過。第三，我很滿意所有 DNS 記錄都正確設置，相關域的 MX 記錄肯定指向我們的郵件伺服器。

我看到一些關於發生類似事情的舊報告，其要點是 Hotmail 嘗試將郵件發送到託管在域的 a-name 記錄而不是 mx-record 的伺服器上。如果它在埠 25 上找到服務，那麼它將嘗試在那裡傳遞。如果不是，那麼它將“回退”並最終查看 mx 記錄。誰能確認這種奇怪的設置仍在發生？

有沒有人遇到過類似的情況？
關於我應該檢查什麼以確保將電子郵件發送到正確的伺服器的任何想法？

謝謝你的幫助，羅布

電子郵件標題

x-store-info:D6taffyBScEUZsL+ZXbbDvsjG9szfvD7
Authentication-Results: hotmail.com; sender-id=pass header.from=postmaster@mail.hotmail.com; dkim=none header.d=mail.hotmail.com; x-hmca=pass
X-SID-PRA: postmaster@mail.hotmail.com
X-SID-Result: Pass
X-DKIM-Result: None
X-AUTH-Result: PASS
X-Message-Delivery: Vj0xLjE7RD0wO0dEPTA7U0NMPTk7bD0x
X-Message-Info: AuEzbeVr9u5fkDpn2vR5iCu5wb6HBeY4iruBjnutBzpStnUabbM/X3OHG1tkHI7a3kMiU15mwZkdItk0fkPUd26iJME4hbgAR+RCB0ejIvg=
Received: from blu0-omc3-s1.blu0.hotmail.com ([65.55.116.76]) by BAY0-HMMC1-F6.Bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900);
    Wed, 23 May 2012 02:54:43 -0700
From: postmaster@mail.hotmail.com
To: robforrest123@hotmail.co.uk
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: <Tx2NT7VXF000c8d13@blu0-omc3-s1.blu0.hotmail.com>
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

--9B095B5ADSN=_01CD299C0888E07C001CA7A1blu0?omc3?s1.blu
Content-Type: message/rfc822

Received: from BLU161-W65 ([65.55.116.73]) by blu0-omc3-s1.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675);
    Wed, 23 May 2012 02:54:38 -0700
Message-ID: <BLU161-W65FD10B04571B7C1A97B7EB6030@phx.gbl>
Return-Path: robforrest123@hotmail.co.uk
Content-Type: multipart/alternative;
   boundary="_517b36bc-f50e-4056-81ff-c55f93271170_"
X-Originating-IP: [82.33.204.39]
From: R F <robforrest123@hotmail.co.uk>
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

....

看起來 Hotmail 似乎喜歡以相反的優先級順序檢查 MX 記錄。看起來我們的備份-備份-備份-備份 mx 記錄（優先級 40）混淆了這件事。我們將看看這將如何發展……

更新

許多年後，這仍然可以正常工作。經驗教訓：與 M$ 相關的任何事情都可能涉及有缺陷的邏輯。

引用自：https://serverfault.com/questions/391787