You get an error when you add a large attachment to an email message in Outlook 2010

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asked Feb 19, 2015 by anonymous

Issue:

When you try to add a large attachment to an email message in Microsoft Office Outlook 2010, you receive the following error message:

“The attachment size exceeds the allowable limit.”

This error occurs for one of the following reasons, depending on the kind of email account that you are using.

  • Internet email account (POP3, IMAP, HTTP)

Outlook 2010 has a new default attachment size limit of 20 megabytes (20480 KB) for Internet email accounts. This limit prevents your computer from continually trying to upload very large attachments that exceed the limits of most Internet service providers. This condition applies whether you are adding one large attachment that is greater than 20 MB or several attachments whose sum total size is greater than 20 MB.

  • Microsoft Exchange Server email account

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. This limit is not related to the new limit introduced in Outlook 2010 for Internet email accounts. This limit for an Exchange mailbox results from the Maximum send size setting that is configured in the Transport Settings Properties dialog box by the Exchange administrator.

Solution:

The steps to modify the default attachment limit depend on the type of email account that you are using with Outlook 2010.

 

  • Internet email account (POP3, IMAP, HTTP)

 

Follow these steps:

 

  1. Close Outlook.
  2. Start Registry Editor.
  3. Find and then select one of the following registry subkeys:

HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences

HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\14.0\Outlook\Preferences

  1. 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) to configure a 30-MB limit.

  1. Close Registry Editor

 

 

  • Microsoft Exchange Server email account

If you are using an Exchange Server account, the new 20-MB attachment limit for Internet email accounts is not used by Outlook 2010. Instead, Outlook uses the limit that is configured on your Exchange server. To change the setting that is used to control the size of a message that is sent through an Exchange Server account, follow these steps:

 

  1. Start the Exchange Management Console.
  2. Under Organization Configuration, select Hub Transport.
  3. In the Global Settings tab, click Transport Settings
  4. In the Transport Settings section of the Actions pane, click Properties.
  5. In the General tab in the Transport Settings Properties dialog box, configure the value for Maximum send size (KB).
  6. Click OK.

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