In Office 365, the default size for messages and email attachments is not set at its maximum capacity . This is because email text is usually quite short and by having this default setting, users are restricted within the maximum attachment size that has been set. However, you can change the maximum message size for an individual mailbox with the Office 365 Admin Center. In this blog post, I have highlighted how to increase mail attachment size in Office 365 by changing the settings in the Exchange admin center.
Increasing the attachment size setting in the Exchange admin center:
- In Office 365, click on the menu button
- Select the ‘Admin’ icon
- Click on ‘Exchange’
- Select ‘Recipients’ from the panel
- Select ‘Mailboxes’ from the drop down list
- From the top panel select ‘Set default message size restrictions’
- In the smaller window that appears, set a maximum size limit for messages that are sent and received, and then save the changes made
Things to consider before increasing the message and attachment size for Microsoft 365:
An increased size limit can be very beneficial for users who either have a higher limit for their general user population, or who have a few specific mailboxes that need to receive very large emails. While many professionals agree that email is not the best method for sending large files, It is also important to understand how the convenience of emailing large files often convinces users to do this. In a modern era of faster networks, cheap storage capacity, and the convenience of email, sending large email attachments has become a requirement for a number of users.
That being said, it is also important to consider whether increasing the message and attachment size for Microsoft 365 is really necessary for your specific needs. Although it may seem like a good idea to turn your size limit to the maximum whether you need it or not, there are a number of things to consider. An example of this is the impact it will have on your network bandwidth and journaling. You may also need to keep in mind that the other companies you may be emailing most likely support a much smaller message size limit, and therefore sending them a large file could mean that they can’t access it due to its size.
If you need to increase the size limit for messages and attachments, then follow the step-by-step guide below to see how you can configure the message size limit in Exchange Online.
Step by step process to Increase the attachment size setting in the Exchange admin center:
- In Office 365, click on the menu button
Go to Office.com and sign in using your credentials. Then click on the menu button on the left hand side corner of the page.
- Select the ‘Admin’ icon
From the list of apps, click on the ‘Admin’ icon.
- Click on ‘Exchange’
When the new page opens, select the ‘Exchange’ option from the side panel under ‘Admin centers’.
- Select ‘Recipients’ from the panel
Then, from the panel on the left hand side, click on the small arrow for ‘Recipients’
- Select ‘Mailboxes’ from the drop down list
A small drop down list will appear. From here, select ‘Mailboxes’
- From the top panel select ‘Set default message size restrictions’
At the top of the page, select ‘Set default message size restrictions’ from the top panel.
- In the smaller window that appears, set a maximum size limit for messages that are sent and received, and then save the changes made
Another smaller window will appear on the left hand side of the screen. Here you can change the maximum size for messages that you send and receive. You can change the setting to any size that you require.
Please note that the maximum size you can set your limit to is 153600 KB.
Thanks for reading! If you have any further questions, please feel free to leave a comment and we’ll be happy to help, or have a look at some of our other blog posts about Microsoft 365:
Anyone who has been given the role of Global Admin has complete control over the domain and network with which they are linked. However, you can turn on notifications for when inboxes are delegated this way you are well aware that admins are accessing your Mailbox. This blog post demonstrates how.
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