Microsoft has announced that Office 365 (Exchange Online) now supports up to 150MB email messages. This is quite a large increase from the previous limit of 25MB (actually 35MB,
https://practical365.com/configuring-max-email-message-size-limits-for-office-365/#:~:text=Microsoft%20has%20announced%20that%20Office,welcome%20change%20for%20many%20customers.
http://woshub.com/how-to-increase-maximum-attachment-size-limit-in-outlook/
By default, Microsoft 365 has a limit of 35 MB for outgoing and 36 MB for incoming emails.
In Exchange Online (Microsoft 365), you can set the maximum message size limit in the settings of each mailbox individually. You can check current limits through the Exchange Admin Center or with PowerShell
In an on-premises Exchange Server, maximum email size limits are configured in several places (at the server, mailbox, and connector levels).
https://docs.microsoft.com/en-us/exchange/recipients/user-mailboxes/mailbox-message-size-limits?view=exchserver-2019
https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits
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