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HOW TO INCREASE OUTLOOK ATTACHMENT SIZE LIMIT IN OFFICE 365?

by Manoj Dwivedi · Published July 11, 2023 · Updated July 22, 2023



Have you ever tried to attach a file to your email in Office 365, only to be met
with an error message saying that file size exceeds the attachment limit? It can
be overwhelming, especially if the file is important to your work. But did you
know that there is a way to increase Outlook attachment size limit in Office
365?

Yes, there are a few ways to increase the size limit for Outlook attachment. In
this article, we’ll explore two methods in detail and show you how to implement
them. So if you’re tired of dealing with Outlook attachment size limit
restrictions, keep reading to learn the ways to increase email attachment size
limit.

Contents [hide]

 * 1 Office 365 Mailbox Default and Maximum attachment size for Outlook
   * 1.1 Office 365 default maximum file size outlook
   * 1.2 Max Size Outlook Attachment and Message in Office 365
 * 2 Ways to Increase Outlook Attachment Size Limit Exchange Online
   * 2.1 Increase Outlook Attachment Size Limit through Exchange Admin Center
   * 2.2 Update Outlook Attachment Size Limit through Windows PowerShell
     * 2.2.1 For Single Mailbox:
     * 2.2.2 For Multiple Mailboxes:
     * 2.2.3 For All MailBoxes
     * 2.2.4 Conclusion:


OFFICE 365 MAILBOX DEFAULT AND MAXIMUM ATTACHMENT SIZE FOR OUTLOOK

In this section, we will explore the default limit in Office 365 for sending and
receiving emails with attachments and how much Outlook attachment size limit we
can increase to use uninterrupted services.


OFFICE 365 DEFAULT MAXIMUM FILE SIZE OUTLOOK

By default the maximum email size in Outlook for sending and receiving email
with attachments is 35 MB. If you try to send email message larger than 35 Mb,
you will end up receiving failed message delivery report. However, we can
increase that limit according to max limit provided by Microsoft. Let’s see how
much we can increase maximum attachment size for Outlook.


MAX SIZE OUTLOOK ATTACHMENT AND MESSAGE IN OFFICE 365

You can increase outlook attachment size limit in Office 365 up to 150 Mb that
includes both email and attachment size. However, the limit varies from one
platform to another. You can see the complete details below:

 * Outlook Message Size Limit:



 * Outlook File Attachment Limit:

Now we know the size limit of email attachment and message, let’s see how to
increase it to maximum or to required size to meet our organization
requirements.




WAYS TO INCREASE OUTLOOK ATTACHMENT SIZE LIMIT EXCHANGE ONLINE

There are two ways to set maximum attachment size for outlook, one is using
Exchange Admin Center and other is through Windows PowerShell. We will discuss
both methods one by one to increase size limit of email attachment.


INCREASE OUTLOOK ATTACHMENT SIZE LIMIT THROUGH EXCHANGE ADMIN CENTER

Please follow the below steps carefully to set max size for outlook attachment:

 * Visit com and click on the Admin to enter into the Office 365 Admin Center.
 * Click on Show all and select Exchange. It will take you to the Exchange Admin
   Center.
 * Once you enter into the EAC, you will see all the mailboxes available in your
   Office 365 account. Choose single or multiple mailboxes, then click on
   Mailflow setting and choose Message Size Restriction.



 * A new window will open on the right side, select the maximum size for sent
   messages and received messages and click on save. I am setting up the limits
   at maximum, however you can choose upon your requirement between 0 to 153600
   KB.



 * Once you click on the save button, it will show you a confirmation message
   for settings updated like in the picture below.




UPDATE OUTLOOK ATTACHMENT SIZE LIMIT THROUGH WINDOWS POWERSHELL

If you like to work using command line interface, then this section is for you.
By using Windows PowerShell, you can easily update Outlook File Size limit for
sending and receiving emails. Below you can see the steps for the same.

 * Open Windows PowerShell as Administrator.
 * Now run the below command and login using Admin Credentials to Connect to
   Exchange Online.

Connect-ExchangeOnline

 * Once connected to Exchange Online, you need to run the below command
   depending on whether you want to set size limit for outlook attachment for
   single mailbox or multiple or all. I am sharing the command for both.

FOR SINGLE MAILBOX:

Set-Mailbox -Identity EmailAddress -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 150 MB size, you can choose any between 0 to 150 MB.

That’s the end of the procedure for increasing Outlook attachment size limit for
Office 365. You can choose any of the two methods discussed above to set email
attachment size limit to maximum.

CONCLUSION:

In this article, we have discussed how to increase Outlook attachment size limit
in Office 365. By following this step-by-step guide you can easily set maximum
email attachment size limit. Whether you are sending large documents or
high-quality images, having a higher attachment size results in uninterrupted
email sending or receiving. I hope this article has helped you with email
attachment size limit in Office 365 Exchange Online. Please share your feedback
in the comment section.

Read More: Recall Email in Outlook





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