在使用Outlook时，用户的附件文件大小上限为 20MB，即用户只能在一封电子邮件中发送 20MB 大的文件。即使使用最新的Outlook版本，也可以看到此大小限制。
附件大小超过允许的限制
每次您尝试附加超出该限制的文件时(that exceeds that limit)，Outlook都会报告一个错误，提示“附件大小超出了允许的限制(The attachment size exceeds the allowable limit)(The attachment size exceeds the allowable limit)。”对于那些需要发送相对较大文件的人来说，这可能有点烦人频繁地。幸运(Lucky)的是，有一种方法可以解决它。在本文中，我们将演示如何在Outlook中超出最大文件大小限制。
有时，当尝试上传大于Outlook最大限制的文件时，会弹出一个对话框，建议您将文件上传到共享位置并共享其链接，例如Google Drive。虽然这是一个可行的解决方案，但它不是最快的解决方案，而且可能会被打断。
如何在Outlook中增加附件大小限制？
该过程非常简单，只需几分钟。我们将使用Windows 注册表编辑器(Windows Registry Editor)进行上述更改。与往常一样，建议您备份当前的注册表配置，因为在此过程中出错可能会对您的系统造成不可逆转的损坏。让我们开始：
打开“运行”(Run)对话框并在空白处键入“Regedit.exe”
然后，根据您在 PC 上运行的Outlook版本，导航到相关键。(Outlook)对于 Outlook 2019和Office 365，它是：
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences
到达那里后，右键单击空白区域并创建一个名为MaximumAttachmentSize(MaximumAttachmentSize)的新键（32 位DWORD 值(DWORD Value)）。
此页面上可能已经存在同名的密钥，在这种情况下，您可以继续下一步
现在，右键单击此键并选择修改(Modify)
更改数值数据以调整Outlook文件所需的最大附件大小。保持基数为十进制并提供基于千字节(Kilobytes)的数字。1MB=1024KB，所以进行相应的计算。
在这里，我将最大文件大小更改为 30MB。如果要完全禁用限制，只需保持值数据等于 0。
您也可以在不实际使用注册表编辑器(Registry Editor)的情况下对注册表进行上述更改。使用命令提示符(Command Prompt)，您可以运行下面的脚本并进行所需的更改。
例如，如果您正在使用Office 365中的(Office 365)Outlook，并且希望将文件大小增加到 40MB，请运行以下命令行。
reg add HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences\ /v "MaximumAttachmentSize" /t REG_DWORD /d 40960 /f
reg add HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\Preferences\ /v "MaximumAttachmentSize" /t REG_DWORD /d 40960 /f
上述命令将创建所需的注册表项并相应地设置其位值。现在，重新启动您的 PC 并尝试在Outlook(Outlook)中上传一个小于您设置的新阈值的文件。
这只有在接收者的电子邮件提供商也允许这些大小的附件时才有效；否则，虽然电子邮件可能会离开您，但收件人的电子邮件提供商可能会拒绝它并且电子邮件将被退回。
相关(Related)：无法将文件附加到 Outlook.com 或桌面应用程序中的电子邮件(Cannot attach files to email in Outlook.com or Desktop app)。
如何压缩文件以通过电子邮件发送？
查看文件对于邮件来说太大的问题的另一种方法是能够压缩它们。这也是一件非常初级的事情。只要文件的接收者有一个工具来解压你的文件，目的就基本解决了。这是你必须做的：
- 打开文件资源管理器(Open File Explorer)并选择要压缩的文件
- 选择后，右键单击它们，然后从选项列表中，将鼠标悬停在“发送(Send)至”上
- 从结果下拉列表中，选择 Compressed ( Zipped ) Folder
希望这篇文章对你有所帮助！
How to increase Attachment Size Limit in Outlook
While using Outlook, users get a 20MB cap on the file size of their attachment, i.e., a user can only mail file(ѕ) as big as 20MB in one email. Τhis size limit has been sеen even with the latest Outlook versions.
The attachment size exceeds the allowable limit
Every time you try and attach a file that exceeds that limit, Outlook reports an error saying, “The attachment size exceeds the allowable limit.” This can be a bit annoying for those who are required to send files of relatively big sizes frequently. Lucky for those, there is a way to play around with it. In this article, we will demonstrate how you can exceed that maximum file size limit in Outlook.
Sometimes, when trying to upload a file bigger than the maximum limit on Outlook, a dialog box pops up advising you to upload the file in a shared location and share its link, like Google Drive. While that is a feasible solution, it isn’t the quickest one and can be riddled with interruptions.
How to increase the attachment size limit in Outlook?
The process is very simple and should take just a couple of minutes. We will be making the said change using the Windows Registry Editor. As always, you’re advised to back up your current Registry configurations since making a mistake in the process can cause irreversible damage to your system. Let us begin:
Open the Run dialog box and in the blank space type ‘Regedit.exe’
Then, based on the version of Outlook you have running on your PC, navigate to the relevant key. For Outlook 2019 and Office 365 it is:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences
Once you’re there, right-click in the blank area and create a new key (32-bit DWORD Value) by the name of MaximumAttachmentSize.
It’s possible that a key by that name already exists on this page, in which case you can move on to the next step
Now, right-click on this key and select Modify
Change the value data to adjust the maximum attachment size you want for your files on Outlook. Keep the base to decimal and provide a number based on Kilobytes. 1MB=1024KB, so make the calculations accordingly.
Here, I’ve changed the maximum file size to be 30MB. If you want to completely disable the limit, simply keep the value data equal to 0.
It is also possible for you to make the above changes to your Registry without actually using the Registry Editor. Using the Command Prompt, you can run the script below and make the desired changes.
For example, if you’re using Outlook from Office 365 and you want to increase the file size to 40MB, run the following command line.
reg add HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences\ /v "MaximumAttachmentSize" /t REG_DWORD /d 40960 /f
reg add HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook\Preferences\ /v "MaximumAttachmentSize" /t REG_DWORD /d 40960 /f
The aforementioned command will create the desirable registry key and set its bit value accordingly. Now, restart your PC and try uploading a file in Outlook smaller than the new threshold you’ve set.
This can work only if the receiver’s email provider also allows attachments of these sizes; else while the email might leave you, the recipient’s email provider may reject it and the email will bounce back.
Related: Cannot attach files to email in Outlook.com or Desktop app.
How do I compress a file to email it?
Another way to look at the problem of files being too big for a mail is to be able to compress them. This, too, is quite an elementary thing to do. As long as the receiver of the file has a tool to decompress your file, the purpose is pretty much resolved. Here’s what you have to do:
- Open File Explorer and select the file or files you want to compress
- Once selected, right-click on them, and from the list of options, hover your mouse over ‘Send to’
- From the resultant drop-down, select Compressed (Zipped) Folder
Hope this article was of help to you!
