On the General tab in the Transport Settings Properties dialog box, configure the value for Maximum send size (KB).In the Transp ort Settings section of the Actions pane, click Properties.On the Global Settings tab, click Transport Settings.(The screenshot for step 2 and 3 is listed below) Under Organization Configuration, click Hub Transport.Regular users do not have access to the Exchange Management Console. You must be an Exchange administrator to make the changes in the following steps.Note Outlook 2016 is not supported when connected to Exchange Server 2007. This Exchange Server setting applies to all versions of Outlook.Similar steps should be used for other versions of Exchange. These steps apply to Exchange Server 2007.To modify the setting that is used to control the size of a message that is sent through an Exchange Server account, follow these steps. Instead, Outlook uses the limit that is configured on your Exchange server. If you are using an Exchange Server account, the 20-MB attachment limit for Internet email accounts is not used by Outlook. Specify a value that is less than 20 MB if you want to configure a limit that is less than the default 20 MB.Specify a value of zero (0) if you want to configure no limit for attachments.

For example, specify 30720 (Decimal) to configure a 30-MB limit. Value data: An integer that specifies the total maximum allowable attachment size. This limit for an Exchange mailbox stems from the Maximum send size setting that is configured in the Transport Settings Properties dialog box by the Exchange administrator (Refer the following screen shot). This attachment limit is not related to the limit in Outlook for Internet email accounts.

If you are using an Exchange Server mailbox, you receive this error message (by default) if you attach one or more items to a message, and if the sum total of the attachments is greater than 10 MB (10240 KB). This limit applies whether you are adding one large attachment that is greater than 20 megabytes (MB) or several attachments whose sum total size is greater than 20 MB.

This limit prevents your computer from continually trying to upload very large attachments that exceed the limits of most Internet service providers. You receive this error message because Outlook 2013 and later versions have a default attachment size limit of 20 megabytes (20480 KB) for Internet email accounts. Internet email account (POP3, IMAP, HTTP) This problem occurs for one of the following reasons, depending on the kind of email account that you are using.

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