The steps to modify the default attachment limit depend on the type of email account that you are using with Outlook. 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 screenshot). 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. Because Outlook can't query a SMTP for the maximum attachment size, it uses a default attachment limit of 20 MB (20480kb), which is about right for most ISPs. Internet email account (POP3, IMAP, HTTP) In order to reduce NDRs and failed sends, Outlook checks the message size before sending and alerts the user that the message is larger than the mail server allows. This problem occurs for one of the following reasons, depending on the kind of email account that you are using. Try putting the file in a shared location and sending a link instead. Find out what is the maximum email size limit for emails & file attachments sent to popular email account providers, such as Gmail,, Yahoo and others.
The file you're attaching is bigger than the server allows. When you add an attachment to an email message in Microsoft Outlook 2013 or later versions, you receive the following error message: Ako Outlook ne dozvoljava da poaljete privitak jer prelazi neko ogranienje, podesite ogranienje veliine privitka za Outlook.