How to Increase Outlook Email Attachment Size Limit in 2024?

If you are an Exchange Online user, then you must have encountered a situation where you are unable to send or receive Outlook attachments larger than 25 MB. Microsoft only allows users to attach documents smaller than 25 MB, but what if we say that users can increase the Outlook attachment size limit on Exchange Online? When users send a significant attachment, it reverts with the error’ file size exceeds the attachment limit.’ This situation is very frustrating, especially when sharing essential files for your work.

This technical guide will provide detailed instructions on increasing the attachment size limit in Office 365 using simple methods. The following section will share two methods: Exchange Admin Center and Exchange PowerShell; understand each solution carefully to increase the size limit.

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Ways to expand Outlook attachment size limit

Users need to follow the manual steps if they want to expand the Office 365 attachment size limit. In the section below, we are sharing two methods to increase the Outlook attachment size restrictions; kindly follow them.

Solution 1: Increasing size limit using EAC

In this method, we will use the Exchange Admin Center and expand the O365 email attachment size limit. Follow the steps below to increase the attachment size on Exchange Online.

Go to the Exchange Admin Center and sign in with admin credentials.
Look for the Mail Flow option and click on it.
Kindly navigate to the Send Connectors option, choose the default Send Connector, and tap the pencil icon to edit it.
After that, move to the Maximum send size option and set the size limit to your liking.
Lastly, click the Save Changes button to apply new changes.

That’s how users can use the EAC to increase the email attachment size limit in Office 365 cloud-based SaaS. Now, let’s navigate to another solution and understand the step-by-step guide to boost the Outlook attachment size limit when sending emails.

Solution 2: PowerShell commands to increase the email size limit

Users can also use a few PowerShell commands to increase Outlook attachment size limit on the Exchange Online. Follow the below steps to expand the email attachment size restriction.

Launch Exchange PowerShell and connect to Exchange Online using the below command.

$UserCredential = Get-Credential

Connect-ExchangeOnline -UserPrincipalName your_admin_username@yourdomain.com -ShowProgress $true

Increase the attachment size limit on sending and receiving emails using the following command:

Set-TransportConfig -MaxSendSize 50MB -MaxReceiveSize 50MB

Save the new changes with the help of the following script.

Get-TransportConfig | Format-List MaxSendSize, MaxReceiveSize

Follow the instructions below to increase the attachment size limit for a specific mailbox.

Use the following script to increase a specific mailbox’s Outlook attachment size limit.

Set-Mailbox -Identity user@domain.com -MaxSendSize 50MB -MaxReceiveSize 50MB

Finally, confirm the new settings by using the below command.

Get-Mailbox user@domain.com | Format-List MaxSendSize, MaxReceiveSize

These are the solutions users can use to increase the Outlook attachment email size limit on Exchange Online. Follow each step carefully to avoid unexpected issues while performing these methods.

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Conclusion:

Users who are willing to learn methods to expand the size limit of attachments while sending or receiving emails can follow the above-given solutions. Using these methods, users can quickly increase the Outlook email attachment size limit in Office 365. Users need the admin credentials to use the Exchange Admin Center to raise the email size limit. Another way is to use PowerShell scripts. Using the PowerShell method, users can set the Office 365 attachment size limit for a specific mailbox.

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Pradeep

Pradeep Katiyar is a true tech geek and fond of writing about new technology and Troubleshooting email client errors. In his spare time, you'll find him sharing how-to guides and making portraits. He has commendable command over Emailing and Troubleshooting.