Hi Winnie
情况是这样的，公司有两路网线，一路是专线有固定IP计划用作电子邮件服务器，另一路是非固定IP用于员工网络接入。CAS服务器就挂在专线上，MBX只接入内网。
关于如何判断邮件是通过MBX发送，是通过退信通知判断。例如谷歌的退信通知如下：
mx.google.com 提供了此错误:
[2002:72f2:5e7d::72f2:5e7d] Our system has detected that this message does not meet IPv6 sending guidelines regarding PTR records and authentication. Please review https://support.google.com/mail/?p=ipv6_authentication_error for more information. bc7si25422308pbd.145 - gsmtp
由于权限或安全问题，您的邮件未送达。可能是被审阅人拒绝、该地址仅接受来自特定发件人的电子邮件，或者其他限制可能阻止传递。
供管理员使用的诊断信息:
生成服务器: MBX.域名
收件人@gmail.com
mx.google.com
Remote Server returned '550-5.7.1 [2002:72f2:5e7d::72f2:5e7d] Our system has detected that this message 550-5.7.1 does not meet IPv6 sending guidelines regarding PTR records and 550-5.7.1 authentication. Please review 550-5.7.1 https://support.google.com/mail/?p=ipv6_authentication_error for more 550 5.7.1 information. bc7si25422308pbd.145 - gsmtp'
原始邮件标题:
Received: from MBX.域名 (192.168.1.206) by MBX.域名 (192.168.1.206) with
Microsoft SMTP Server (TLS) id 15.0.847.32; Fri, 23 Oct 2015 09:47:08 +0800
Received: from MBX.域名 ([::1]) by MBX.域名 ([::1]) with mapi id
15.00.0847.040; Fri, 23 Oct 2015 09:47:07 +0800
From: =?gb2312?B?zfXwqdPu?= <wanghy@域名>
To: "收件人@gmail.com" <收件人@gmail.com>
Subject: =?gb2312?B?09rKx9TZtM6y4srU?=
Thread-Topic: =?gb2312?B?09rKx9TZtM6y4srU?=
Thread-Index: AdENNLFWdcGa/7yuRQ64Nl4Oke1s3g==
Date: Fri, 23 Oct 2015 01:47:06 +0000
Message-ID: <67619e3c8b0b49eaa17188b7fce5664c@MBX.域名>
Accept-Language: zh-CN, en-US
Content-Language: zh-CN
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
x-originating-ip: [192.168.1.139]
Content-Type: multipart/related;
boundary="_004_67619e3c8b0b49eaa17188b7fce5664cMBXbphlcn_";
type="multipart/alternative"
MIME-Version: 1.0
另外，发送连接器设置如下：
[PS] C:\Windows\system32>Get-SendConnector | fl
AddressSpaces : {SMTP:*;1}
AuthenticationCredential :
CloudServicesMailEnabled : False
Comment :
ConnectedDomains : {}
ConnectionInactivityTimeOut : 00:10:00
DNSRoutingEnabled : True
DomainSecureEnabled : False
Enabled : True
ErrorPolicies : Default
ForceHELO : False
Fqdn :
FrontendProxyEnabled : True
HomeMTA : Microsoft MTA
HomeMtaServerId : MBX
Identity : internet
IgnoreSTARTTLS : False
IsScopedConnector : False
IsSmtpConnector : True
MaxMessageSize : 100 MB (104,857,600 bytes)
Name : internet
Port : 25
ProtocolLoggingLevel : None
RequireOorg : False
RequireTLS : False
SmartHostAuthMechanism : None
SmartHosts : {}
SmartHostsString :
SmtpMaxMessagesPerConnection : 20
SourceIPAddress : 0.0.0.0
SourceRoutingGroup : Exchange Routing Group (DWBGZMFD01QNBJR)
SourceTransportServers : {MBX}
TlsAuthLevel :
TlsCertificateName :
TlsDomain :
UseExternalDNSServersEnabled : True
我测试了你说的重启这些服务，但是跟之前并没有区别（通过谷歌的退信判断）。
非常感谢你的帮助！
Exchange 2013 服务外传邮件的一些疑问
