通常，当我们使用Microsoft Outlook^{(Microsoft Outlook)}发送电子邮件时，我们不会注意附件文件的大小。但是，我们附加的文件必须低于为Outlook指定的20 MB限制。因此，只要您的电子邮件附件大小绕过此限制，Outlook就会生成以下错误，并阻止您附加文件或发送电子邮件。

附件大小超过允许的限制

因此，如果您是Outlook用户，必须将大文件作为电子邮件附件发送^{(sending large size files as email attachments)}，您必须更改Outlook的默认附件大小限制^{(attachment size limit)(attachment size limit)}。但是，没有直接设置可以更改此约束。您将不得不使用这个简单的注册表调整来设置您想要的电子邮件附件大小限制^{(set your desired limit for email attachment size)}。

1.按Windows Key + R组合，在运行^(Run)对话框中键入 put regedit ，然后^(regedit)按 Enter^(Enter)打开注册表编辑器。^{( Registry Editor.)}

2.导航到这里：

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences

3.在此注册表位置的右窗格中，右键单击空白区域并选择New -> DWORD Value。

将新创建的DWORD命名^(DWORD)为^{(MaximumAttachmentSize)}MaximumAttachmentSize  。双击 no this REG_DWORD修改其数值数据^{(Value data)}：

4. 在上图中，将数值数据^{(Value data)}设置为0，将无限^(unlimited)大小设置为附件大小。如果您想扩展限制，例如，使其为50 MB，则设置为 50000。单击确定^(OK)，然后关闭注册表编辑器^{(Registry Editor)}。

重新启动机器以使更改生效。

Hope you find the trick useful!

The attachment size exceeds the allowable limit In Outlook

Generallу, when we send emails using Microsoft Outlook, we do not pay attention to the attachment file size. However, the files we attach have to be under the limit specified for Outlook which is 20 MB. Thus whenever your email attachment size bypasses this limit, Outlook will generate the following error, and prevent you from attaching the file or sending the email.

The attachment size exceeds the allowable limit

Thus if you’re an Outlook user who has to deal by sending large size files as email attachments, you must change the Outlook‘s default attachment size limit. However, there is no direct setting to change this constraint. You will have to use this simple registry tweak to set your desired limit for email attachment size.

1. Press Windows Key + R combination, type put regedit in Run dialog box and hit Enter to open the Registry Editor.

2. Navigate here:

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences

3. In the right pane of this registry location, right-click in the blank space and select New -> DWORD Value.

Name the newly created DWORD as MaximumAttachmentSize. Double click no this REG_DWORD to modify its Value data:

4. In the above-shown box, put the Value data as 0 to set unlimited size as attachment size. If you want to extend the limit, for example, to make it 50 MB, then put 50000. Click OK, and close the Registry Editor.

Reboot the machine to make changes effective.

Hope you find the trick useful!

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