How to Increase Outlook Attachment Size Limit in Office 365?

Have you ever attempted to add a file to your email using Office 365, only to receive an error message: Attachment size exceeds allowable limit? It’s quite difficult, especially if files are important to your work. But did you know there’s a way to raise the Outlook attachment size limits in Office 365?

Yes, there are several methods to increase the size limit for Outlook attachments. This article will go over two strategies in depth and explain how to apply these methods. If you’re fed up with Outlook attachment size limit restrictions, keep reading to see how to increase Outlook attachment size limit.

Why Increase the Outlook Attachment Size Limit?

Here are some common reasons organizations increase Outlook attachment limits:

• Sharing high-resolution images and videos
• Sending large project files
• Transferring CAD or design documents
• Collaborating on enterprise reports
• Reducing dependency on third-party file-sharing tools

Office 365 Mailbox Default and the Maximum Attachment Size for Outlook

In this section, we’ll look at the default limit set by Office 365 for sending and receiving emails that contain attachments. We will also explore how much the Outlook attachment size limits can be raised to enable uninterrupted services.

Office 365 Default Maximum File Size for Outlook

By default, the maximum email size Outlook allows for sending and receiving emails with attachments is 35 MB. If you attempt to send emails larger than 35 MB, the recipient will receive a failed message delivery report. We can raise that limit based on Microsoft. Let’s find out how much we can increase the maximum attachment size for Outlook.

Max Size Outlook Attachment and Message in Office 365

You can increase the Outlook attachment size limit to 150 Mb which includes attachment and email size. The limit is different between platforms. You see the specifics below:

Also read: Outlook Not Receiving Emails? 8 Quick Fixes to Solve Email Problems

How to Increase Outlook Attachment Size Limit in Exchange Online

There are two methods to set the maximum attachment size for Outlook: one is via Exchange Admin Center, and the other is via Windows PowerShell. We will look at both approaches individually to increase the capacity of the email attachment.

1. Enhance Outlook’s Attachment Size Limits through Exchange Admin Center

Follow the steps below carefully to set the max size for Outlook attachments:

• Go to www.com and click the Admin option to sign in to Office 365 Admin Center.
• Select Show All and then select Exchange. You will be taken into the Exchange Admin Center.
• When you enter EAC, you’ll see all mailboxes within the Office 365 account. Choose one or more mailboxes.
• Then select the Mailflow settings and select Message Size Restriction.
• A new tab will open on the right, select the maximum size for both sent and received messages, and click save. I’m setting the limit to be at the maximum size, but you can select a size between 0 and 153600 KB.
• After you hit”Save”, it’ll show a confirmation message that the settings have been updated.

2. Increase Outlook Attachment Size Limit Using PowerShell

If you prefer working with a command-line interface, this article is for you. With Windows PowerShell, you can easily modify the Outlook File Size limit for sending and receiving emails. Below are the steps required to accomplish this.

Step 1: Open Windows PowerShell as Administrator.
Run the following command and log in using the Administrator Credentials to connect to Exchange Online.

Step 2: Connect to Exchange Online

Run the following command and sign in using Office 365 administrator credentials.

Step 3: Increase Outlook Attachment Size Limit

For a Single Mailbox
Set-Mailbox -Identity user@domain.com -MaxSendSize 150MB -MaxReceiveSize 150MB

For Multiple Mailboxes
(“mailbox1″,”mailbox2”) | % {Set-Mailbox -Identity $_ -MaxSendSize 150MB -MaxReceiveSize 150MB}

For All Mailboxes
Get-Mailbox -ResultSize Unlimited | Set-Mailbox -MaxReceiveSize 150MB -MaxSendSize 150MB

NOTE: I have selected 150MB as the size, but you can select between 0 MB and 150 MB.

Also read: How to Recall an Email in Outlook: A Step-by-Step Guide

Common Outlook Attachment Size Errors

Users may encounter several attachment-related errors when sending large files in Outlook, including:

• Attachment size exceeds the allowable limit
• Message too large
• Outlook cannot send this message
• Delivery failed due to message size restrictions

These errors usually occur when the attachment exceeds the configured mailbox or server size limit.

Benefits of Increasing Outlook Attachment Size Limit

Increasing the Outlook email attachment size limit offers several advantages for businesses and organizations, including:

• Easy sharing of large files and business documents
• Improved team collaboration
• Better workflow efficiency
• Reduced dependency on third-party file-sharing tools
• Faster communication for large project files

Wrap Up

The article explains how to increase the Outlook attachment size limits in Office 365. If you follow this step-by-step guide, you can set an email attachment limit that is the maximum size. If you’re sending large documents or high-quality images, having a higher attachment size can result in uninterrupted email receiving or sending. I hope this article provided you with information about the Outlook file size limit in Office 365 Exchange Online.

FAQs About Outlook Attachment Size Limit