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Visit the dedicated forum to share, explore and If you have feedback for TechNet Subscriber Support, Click here to learn more. By default, this file is located in the following directory: 2.Create a copy of the file as a backup.
Mac outlook 2016 attachment size limit windows#
such as or Gmail, the combined file size limit is 20 megabytes (MB) and for Exchange accounts (business email), the default combined file size limit is 10 MB. You can use a text editor to modify the Web.config file to increase or decrease attachment file size: 1.Start Windows Explorer, and then locate the Web.config file. Please remember to mark the replies as answers if they helped. This limit prevents your computer from continually trying to upload very large attachments that exceed the limits of most Internet service providers. Because message attachments are Base64-encoded before they are transferred, the value must be set high enough to accommodate the desired message size togetherįor example, to allow messages of approximately 20 MB, perform the following calculation:Ģ0971520 bytes * 4/3 for Base64 encoding = 27962027 (rounded up) By default, this entry appears as follows in Microsoft Exchange Server 2010 RTM:ĥ.Change the value for maxAllowedContentLength to accommodate the message size that you want to allow. %ProgramFiles%\Microsoft\Exchange Server\V14\ClientAccess\exchweb\ewsģ.Open the Web.config file by using a text editor, such as Notepad.Ĥ.Search for the maxAllowedContentLength and maxReceivedMessageSize entry. By default, this file is located in the following directory: You can use a text editor to modify the Web.config file to increase or decrease attachment file size:ġ.Start Windows Explorer, and then locate the Web.config file. What error did you receive when you sending the attachment file? In order to narrow down the issue, please help us confirm the following questions: There is a 20 MB limit on the maximum attachment size in the Outlook email client (including the latest versions of Outlook for Office 365 and Office 2019/2016).