The default send and receive message size limit within Exchange Online is 35MB, to amend this (currently to a maximum of 150MB), use the following commands:
To modify the MailBoxPlan for all future mailboxes:
Get-MailboxPlan | Set-MailboxPlan -MaxSendSize 50MB -MaxReceiveSize 50MB
Modify an individual mailbox:
Set-Mailbox -Identity user.name@domain.local -MaxSendSize 50MB -MaxReceiveSize 50MB
Modify all existing mailboxes:
Get-Mailbox | Set-Mailbox -MaxSendSize 50MB -MaxReceiveSize 50MB
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