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Increase the file size limit on attachments


You can increase the maximum size of an attachment or attachments that can be sent in an Outlook email message by changing a setting in Registry Editor. By default, Outlook will not allow you to send an email greater than 20 MB.

In the menu under HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences

With this folder selected, go to Edit . . . New . . . DWORD (32-bit) Value and name the new file as 'MaximumAttachmentSize'.

Double-click this new field, so you can edit it. With decimal selected, enter a limit in KB - so 100,000 for 100 MB.


Sean O'Shea has more than 20 years of experience in the litigation support field with major law firms in New York and San Francisco.   He is an ACEDS Certified eDiscovery Specialist and a Relativity Certified Administrator.

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The views expressed in this blog are those of the owner and do not reflect the views or opinions of the owner’s employer.

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