![]() In the results, expand requestLimits, and you'll see maxAllowedContentLength and the default value 30000000 (bytes). Verify the Features View tab is selected at the bottom, and double-click Configuration Editor in the Management section.Ĭlick the drop down arrow in the Section field, navigate to system.webServer > security and select requestFiltering. To see these values for ActiveSync on Mailbox servers in IIS Manager, perform the following steps:įor the Client Access (frontend) web site, open IIS Manager, navigate to Sites > Default Web Site and select Microsoft-Server-ActiveSync.įor the backend web site, open IIS Manager, navigate to Sites > Exchange Back End and select Microsoft-Server-ActiveSync. However, the maximum message size for ActiveSync is affected by the maxAllowedContentLength value that is applied to all web sites on the server. MaxAllowedContentLength="30000000 bytes" (not present by default see comments)īy default, there is no maxAllowedContentLength key in the web.config files for ActiveSync. %ExchangeInstallPath%ClientAccess\Sync\web.config MaxAllowedContentLength="30000000" (not present by default see comments) %ExchangeInstallPath%FrontEnd\HttpProxy\Sync\web.config For example, if you specify a maximum message size value of 64 MB, you can expect a realistic maximum message size of approximately 48 MB. Base64 encoding increases the size of the message by approximately 33%, so the value you specify should be approximately 33% larger than the actual message size you want enforced. This accounts for the Base64 encoding of attachments and other binary data. Your questions on this subject You can ask using the comments field at the bottom.For any message size limit, you need to set a value that's larger than the actual size you want enforced. ![]() Note: The total upload time of the attachment you will add to the mail should not exceed 60 minutes, otherwise you will encounter an error. Find MaxRequestLength and change its value. Open the original file in notepad with the open with method.ģ. \Program Files\Microsoft\ExchangeServer\ClientAccess\Owa is below.Ģ. Locate the Web.config file on the Calient Access Server. Now let's try to change the MaxRequestLength value using Notepad.ġ. To change the size, you must be a member of at least the Local Administrators group before starting the steps below. This message could not be sent because it exceeds the maximum size allowed. If the user has attached a large number of files to an e-mail and each one is smaller than MaxSendSize or MaxRequestLength, but their total exceeds the maximum message size, the message when pressing the Send bot in OWA is: “The files were not attached because they exceed the maximum size limit of megabytes (MB) for attachments.” When the user tries to send an attachment greater than ASP.NET MaxRequestLength, the error message is: For more information, contact technical support for your organization.” “The attachment you are trying to upload exceeds the maximum size limit for attachments allowed by your organization. ![]() When the user wants to send an attachment that exceeds the maximum message size, the error message is: The content of the error produced in the above-mentioned case differs according to the conditions You can find the detailed article on changing the MaxSendSize size at the link below:Ĭhanging Global and Organizational message size limits in Exchange 2007 To avoid this error, you should set maxRequestLength at least as much as MaxSendSize. Messages sent in OWA will generate an error if the MaxRequestLength value is less than the maximum message size (MaxSendSize) for sending in the mailbox. MaxRequestLength is the ASP.NET setting that determines the maximum data size that the Web browser will transmit to the Client Access Server, and web.config located in the file. The setting we will change maxRequestLength is the setting. Since OWA is an application that uses ASP.Net, its structure will change with the change of ASP.Net settings. To increase this size, the Web.config file must be edited on the Exchange Server 2007 computer with the Client Access server role. The size of the attachment in the e-mails you can send using Outlook Web Access is up to 30 MB.
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