In my last post, I explained how you can change the mailbox size limits for individual mailboxes. Today, I show how you can set the default maximum mailbox send and receive limits for all new mailboxes by modifying the default Office 365 mailbox plan.

Michael Pietroforte

Michael Pietroforte is the founder and editor of 4sysops. He is a Microsoft Most Valuable Professional (MVP) with more than 30 years of experience in IT management and system administration.

The mailbox plan is a template with mailbox properties that Exchange Online applies when you create a new mailbox. Before you can view or change a mailbox plan, you have to establish a PowerShell connection to Office 365.

Signing in to Office 365

Signing in to Office 365

You can now view the available Office 365 mailbox plans with the Get-MailboxPlan cmdlet:

Viewing Office 365 mailbox plans

Viewing Office 365 mailbox plans

The IsDefault property shows you the default mailbox plan that Exchange Online applies whenever you create a new mailbox.

To show only your default plan, you can run the next command:

Viewing the default mailbox plan

Viewing the default mailbox plan

The following command displays all properties that Office 365 uses in your default plan:

Displaying the mailbox plan properties

Displaying the mailbox plan properties

The property list is quite long, and you have to scroll down to find the maximum send and receive size. The properties you have to search for are MaxSendSize and MaxReceiveSize. You can view your default send and receive size settings with the next command:

Viewing the maximum send and receive size

Viewing the maximum send and receive size

The default configuration is 35 MB, and the maximum you can set is 150 MB:

Changing the default maximum send and receive size

Changing the default maximum send and receive size

Don't forget to add "MB" to the size; otherwise you will end up with a maximum size of 1 KB. Of course, you can work with different sizes for send and receive settings. Note that the size settings are for an entire email including attachments.

The above command won't change the settings of existing mailboxes. Only new mailboxes will use the new properties. If you want to change the settings of existing mailboxes, you can use the Office 365 admin center or PowerShell as I explained in my previous post.

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