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How to Increase Maximum Attachment Size Limit in Outlook
Posted by Thang Le Toan on 27 August 2017 03:06 AM
There is a 20 MB limit on the maximum attachment size in Outlook mail client (including the latest 2010 / 2013 versions). It doesn’t matter if a single large file or several small ones are attached — the total attachment size would not exceed 20 MB.
When trying to send a letter of more than 20 MB using Outlook, the following error message appears:
If your mail server and the recipient’s server supports a larger size of message attachments, you can increase this limit in Outlook.
You can the maximum size of attachments in Outlook only through the registry. There is no such setting in the Outlook GUI.
After the changes are made, you can attach larger files to your letters in Outlook (in our example, we have attached a 58 MB PST file).
If your mail server or the recipient mail server do not support letters of a larger size, when trying to send a large email message, you will get an NDR (Non delivery report) with the information that the maximum attachment size has been exceeded. Here are sample messages you can get:
The following table contains the maximum attachment sizes in the most popular email services:
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