How to Change maximum Office 365 attachment size with PowerShell

The default Office 365 maximum message size for messages is 35MB. Because the email text is usually small, this setting essentially restricts the maximum attachment size. You can change the maximum message size for an individual mailbox in the Office 365 admin center or with PowerShell.

To check the current message sending/receiving limt

Get-Mailbox -Identity “UserName@YourDomain.com” | fl maxsendsize,maxreceivesize

To set the message sending/receiving limit to 150 MB

Set-Mailbox -Identity “UserName@YourDomain.com” -MaxReceiveSize 150MB -MaxSendSize 150MB

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