Attachment size exceeds the allowable limit error - Outlook

Attachment size exceeds the allowable limit error when you add a large attachment đồ sộ an tin nhắn message in Outlook

Original KB number:   2813269

Symptoms

When you add an attachment đồ sộ an tin nhắn message in Microsoft Outlook 2013 or later versions, you receive the following error message:

The tệp tin you're attaching is bigger kêu ca the server allows. Try putting the tệp tin in a shared location and sending a liên kết instead.

Cause

This problem occurs for one of the following reasons, depending on the kind of tin nhắn tài khoản that you are using.

Internet tin nhắn tài khoản (POP3, IMAP, HTTP)

You receive this error message because Outlook 2013 and later versions have a mặc định attachment size limit of trăng tròn megabytes (20480 KB) for Internet tin nhắn accounts. This limit prevents your computer from continually trying đồ sộ upload very large attachments that exceed the limits of most Internet service providers. This limit applies whether you are adding one large attachment that is greater kêu ca trăng tròn megabytes (MB) or several attachments whose sum total size is greater kêu ca trăng tròn MB.

Microsoft Exchange Server tin nhắn account

If you are using an Exchange Server mailbox, you receive this error message (by default) if you attach one or more items đồ sộ a message, and if the sum total of the attachments is greater kêu ca 10 MB (10240 KB). This attachment limit is not related đồ sộ the limit in Outlook for Internet tin nhắn accounts. 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).

Resolution

The steps đồ sộ modify the mặc định attachment limit depend on the type of tin nhắn tài khoản that you are using with Outlook.

Internet tin nhắn tài khoản (POP3, IMAP, HTTP)

To modify the mặc định attachment limit size in Outlook for an Internet tin nhắn tài khoản yourself, follow these steps:

1. Exit Outlook.

2. Start Registry Editor.

3. Locate and then select one of the following registry subkeys:

   HKEY_CURRENT_USER\Software\Microsoft\Office\\Outlook\Preferences
   HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\ x.0 \Outlook\Preferences

   Note

   • The placeholder represents your version of Office (16.0 = Office năm 2016, Office 2019, Office LTSC 2021, or Microsoft 365, 15.0 = Office 2013).
   • Manually create the path in the registry if it does not currently exist.

4. Add the following registry data under this subkey:

   Value type: DWORD
   Value name: MaximumAttachmentSize
   Value data: An integer that specifies the total maximum allowable attachment size. For example, specify 30720 (Decimal) đồ sộ configure a 30-MB limit.

   Note

   • Specify a value of zero (0) if you want đồ sộ configure no limit for attachments.
   • Specify a value that is less kêu ca trăng tròn MB if you want đồ sộ configure a limit that is less kêu ca the mặc định trăng tròn MB.

5. Exit Registry Editor

6. Start Outlook.

Microsoft Exchange Server tin nhắn account

If you are using an Exchange Server tài khoản, the 20-MB attachment limit for Internet tin nhắn accounts is not used by Outlook. Instead, Outlook uses the limit that is configured on your Exchange server. To modify the setting that is used đồ sộ control the size of a message that is sent through an Exchange Server tài khoản, follow these steps.

1. Start the Exchange Management Console.

2. Under Organization Configuration, select Hub Transport. (The screenshot for step 2 and 3 is listed below)

3. On the Global Settings tab, select Transport Settings.

   

4. In the Transport Settings section of the Actions pane, select Properties.

5. On the General tab in the Transport Settings Properties dialog box, configure the value for Maximum send size (KB).

6. Select OK.