问题描述：
Exchange2016的服务器，同事反应发邮件时，附件不能超25MB。
查看服务器里的相关的设置都是100MB
解决方法：
通过查看官方文档，打开 cmd 复制执行下面%windir%的部分命令，重新IIS服务，问题解决。
注：下面的数值表示200MB
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ActiveSync
%ExchangeInstallPath
%
FrontEnd\HttpProxy\Sync\web.config
%ExchangeInstallPath
%
ClientAccess\Sync\web.config
%windir%\system32\inetsrv\appcmd.exe set config
"Default Web Site/Microsoft-Server-ActiveSync/"
-section:system.webServer/security/requestFiltering /requestLimits.maxAllowedContentLength:235000000
%windir%\system32\inetsrv\appcmd.exe set config
"Default Web Site/Microsoft-Server-ActiveSync/"
-section:system.web/httpRuntime /maxRequestLength:235000
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/Microsoft-Server-ActiveSync/"
-section:system.webServer/security/requestFiltering /requestLimits.maxAllowedContentLength:235000000
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/Microsoft-Server-ActiveSync/"
-section:system.web/httpRuntime /maxRequestLength:235000
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/Microsoft-Server-ActiveSync/"
-section:appSettings /[key=
'MaxDocumentDataSize'
].value:235000000
Exchange Web 服务
%ExchangeInstallPath
%
FrontEnd\HttpProxy\ews\web.config
%ExchangeInstallPath
%
ClientAccess\exchweb\ews\web.config
%windir%\system32\inetsrv\appcmd.exe set config
"Default Web Site/ews/"
-section:system.webServer/security/requestFiltering /requestLimits.maxAllowedContentLength:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.webServer/security/requestFiltering /requestLimits.maxAllowedContentLength:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSAnonymousHttpsBinding'
].httpsTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSAnonymousHttpBinding'
].httpTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSBasicHttpsBinding'
].httpsTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSBasicHttpBinding'
].httpTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSNegotiateHttpsBinding'
].httpsTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSNegotiateHttpBinding'
].httpTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSWSSecurityHttpsBinding'
].httpsTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSWSSecurityHttpBinding'
].httpTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSWSSecuritySymmetricKeyHttpsBinding'
].httpsTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSWSSecuritySymmetricKeyHttpBinding'
].httpTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSWSSecurityX509CertHttpsBinding'
].httpsTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /customBinding.[name=
'EWSWSSecurityX509CertHttpBinding'
].httpTransport.maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /webHttpBinding.[name=
'EWSStreamingNegotiateHttpsBinding'
].maxReceivedMessageSize:279668280
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/ews/"
-section:system.serviceModel/bindings /webHttpBinding.[name=
'EWSStreamingNegotiateHttpBinding'
].maxReceivedMessageSize:279668280
Web 上的 Outlook
%ExchangeInstallPath
%
FrontEnd\HttpProxy\owa\web.config
%ExchangeInstallPath
%
ClientAccess\Owa\web.config
%windir%\system32\inetsrv\appcmd.exe set config
"Default Web Site/owa/"
-section:system.webServer/security/requestFiltering /requestLimits.maxAllowedContentLength:235000000
%windir%\system32\inetsrv\appcmd.exe set config
"Default Web Site/owa/"
-section:system.web/httpRuntime /maxRequestLength:235000
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/owa/"
-section:system.webServer/security/requestFiltering /requestLimits.maxAllowedContentLength:235000000
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/owa/"
-section:system.web/httpRuntime /maxRequestLength:235000
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/owa/"
-section:system.serviceModel/bindings /webHttpBinding.[name=
'httpsBinding'
].maxReceivedMessageSize:235000000
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/owa/"
-section:system.serviceModel/bindings /webHttpBinding.[name=
'httpBinding'
].maxReceivedMessageSize:235000000
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/owa/"
-section:system.serviceModel/bindings /webHttpBinding.[name=
'httpsBinding'
].readerQuotas.maxStringContentLength:235000000
%windir%\system32\inetsrv\appcmd.exe set config
"Exchange Back End/owa/"
-section:system.serviceModel/bindings /webHttpBinding.[name=
'httpBinding'
].readerQuotas.maxStringContentLength:235000000
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Exchange 2010修改web.config里的值
<requestLimits maxAllowedContentLength="35000000" />
参考：
https://technet.microsoft.com/zh-cn/library/hh529949(v=exchg.160).aspx
本文转自cix123 51CTO博客，原文链接：http://blog.51cto.com/zhaodongwei/1972937，如需转载请自行联系原作者
