451超时尝试从某些外部联系人validationRCPT错误

两家公司的外部联系人报告他们发送给我们的消息，并返回以下消息：

451超时尝试validation域名的RCPT [email protected]

其中一家公司是一个非常大的国际组织，所以我怀疑这个问题到底是怎么一回事。

我理解这个消息通常意味着我的服务器在响应来自其他服务器的RCPT消息之前断开连接。

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我有一台Exchange 2007服务器，第一批报告问题的人（以及能够获得错误消息副本的人）正在运行Lotus Domino（我不记得Domino的支持日子）。

我们还通过DNSMadeEasy使用电子邮件备份服务来处理我们所有的传入消息，这样，如果我们的服务器在一段时间内失去与互联网的联系，这些消息都会被DNSMadeEasy接收和排队，并且在build立连接之后，消息被传递给我们。

我做的事情：

• testing内部/外部电子邮件通信使用我的个人外部帐户，并没有问题。
• 已validation我没有在Exchange中configuration的反垃圾邮件黑名单。
• 检查了我的McAfee Groupshield日志，并validation它没有拒绝来自这些发件人的任何消息。

我从哪里出发？

这里是关于它认为问题是什么的Lotus Notes的完整输出（适当模糊）（对不起，第一部分中的文本，我无法正确地stream水线）：

> Reporting-MTA: x-local-hostname; localdomain > Authentication-Results: p01c11m085.mxlogic.net; spf=none X-MXL-Hash: > 51ae20e2194675c6-9ab61e697b19b6b20a310d95e60b43dac243397d > From: Mail Delivery System <[email protected]> > To: [email protected] > Subject: Warning: could not send message for past 4 hours > Message-Id: <[email protected]> > Date: Tue, 04 Jun 2013 11:16:10 -0600 > MIME-Version: 1.0 > X-MX-Bounce: mod_queue/warn > X-AnalysisOut: [A:9 a=vypMwE87fLIA:10] > Received-SPF: None > X-Spam: [F=0.1384615385; B=0.500(0); spf=0.500; STSI=0.500(-49); STSM=0.300(-49); CM=0.500; MH=0.600(2013060409); S=0.200(2010122901); SC=] > X-MAIL-FROM: <> > X-SOURCE-IP: [208.65.144.222] > X-MIMETrack: Itemize by SMTP Server on TheirCompany-NT/TheirCompany(Release 6.5.1|January 21, 2004) at 06/04/2013 12:16:36 PM, > Serialize by Router on TheirCompany-NT/TheirCompany(Release 6.5.1|January 21, 2004) at 06/04/2013 12:16:38 PM, > Serialize complete at 06/04/2013 12:16:38 PM > X-Notes-Item: CN=TheirCompany-NT/O=TheirCompany; type=501; flags=44; name=$UpdatedBy > X-Notes-Item: 8EC07872:EEDBFA2A-86257B80:005EE789; type=4; name=$Orig X-Notes-Item: ; type=501; name=Categories > X-Notes-Item: ; type=401; name=$Revisions > X-Notes-Item: CN=TheirCompany-NT/O=TheirCompany; type=501; flags=0; name=RouteServers > X-Notes-Item: 04-Jun-2013 12:16:36 CDT/04-Jun-2013 12:16:37 CDT; type=401; flags=0; name=RouteTimes > X-Notes-Item: 0; name=$MsgTrackFlags > X-Notes-Item: Tue, 4 Jun 2013 12:16:37 -0500; type=400; name=DeliveredDate > X-Notes-Item: TheirCompany-NT/TheirCompany!!mail/theirnsf.nsf: =?UTF-8?B?4oChODYyNTcxNUQwMDUzNjc2Nyg=?= =?UTF-8?B?OEVDMDc4NzJFRURCRkEyQTg2MjU3QjgwMDA1RUU3ODkp?=; name=$SJOrigin > X-Notes-Item: [email protected]; name=$SJInternetAddress > X-Notes-Item: [email protected]; name=$SJEmail > X-Notes-Item: p01c11o143.mxlogic.net; name=$SJDomain Received: from p01c11m085.mxlogic.net ([208.65.144.247]) by mail.theirdomain.com (Lotus Domino Release 6.5.1) with SMTP id 2013060412163648-12883 ; Tue, 4 Jun 2013 12:16:36 -0500 Received: from unknown [208.65.144.222] (EHLO p01c11q162.mxlogic.net) by p01c11m085.mxlogic.net(mxl_mta-7.1.0-2) over TLS secured channel with ESMTP id 2e02ea15.0.9233563.00-1301.13111517.p01c11m085.mxlogic.net (envelope-from <>); Tue, 04 Jun 2013 11:16:18 -0600 (MDT) Received: from unknown [10.1.111.143] (EHLO p01c11o143.mxlogic.net) by p01c11q162.mxlogic.net(mxl_mta-7.1.0-3) over TLS secured channel with ESMTP id 2e02ea15.0.9064.00-2396.25366.p01c11q162.mxlogic.net (envelope-from <>); Tue, 04 Jun 2013 11:16:18 -0600 (MDT) Received: FROM queue-bounce BY 01c11o143.mxlogic.net WITH local; Tue, 04 Jun 2013 11:16:10 -0600 > X-Notes-Item: Memo; name=Form > X-Notes-Item: 1; name=$NoteHasNativeMIME Content-Type: multipart/report; report-type=delivery-status; boundary="Q=_941804289-1370366170-p01c11o143.mxlogic.net" > > This is a MIME-formatted message. Portions of this message may be unreadable without a MIME-capable mail program. > > --Q=_941804289-1370366170-p01c11o143.mxlogic.net Content-Type: text/plain > > =============================================== > THIS IS A WARNING MESSAGE ONLY > YOU DO NOT NEED TO RESEND YOUR MESSAGE > =============================================== > > A temporary error occurred while delivering to the following > address(es): > > <[email protected]>: 451 Timeout trying verify RCPT > ([email protected]) for domain (mydomain.com) > > I will continue trying to send the message until it is delivered or > expires. > > > > --Q=_941804289-1370366170-p01c11o143.mxlogic.net Content-Type: text/plain > > Included is a copy of the message header: > ----------------------------------------- Received: from unknown [67.89.110.78] (EHLO mail.theirdomain.com) > by p01c11o143.mxlogic.net(mxl_mta-7.1.0-3) > with ESMTP id ad5eda15.0.73070.00-330.174376.p01c11o143.mxlogic.net (envelope-from > <[email protected]>); > Tue, 04 Jun 2013 07:05:26 -0600 (MDT) X-MXL-Hash: 51ade6163c8c4185-18c8ce3cbb57672918d5c615db6b50a5e7accd4d To: > [email protected] Subject: Fw: DELIVERY FAILURE: MIME-Version: 1.0 > X-Mailer: Lotus Notes Release 8.5.2 August 10, 2010 Message-ID: > <OF52E79DBB.50860208-ON86257B80.0047C79E-86257B80.0047D1CD@theirdomain.com> > From: [email protected] Date: Tue, 4 Jun 2013 08:04:27 -0500 > X-MIMETrack: Serialize by Router on > TheirCompany-NT/TheirCompany(Release 6.5.1|January 21, 2004) at > 06/04/2013 08:05:26 AM, > Serialize complete at 06/04/2013 08:05:26 AM Content-Type: multipart/alternative; boundary="=_alternative > 0047D1CC86257B80_=" > > --Q=_941804289-1370366170-p01c11o143.mxlogic.net--