How to set up a multifunction device or application to send emails
https://learn.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-set-up-a-multifunction-device-or-application-to-send-email-using-microsoft-365-or-office-365
WEBDec 14, 2023 · To send emails using Microsoft 365 or Office 365 SMTP relay, your device or application server must have a static IP address or address range. You can't use SMTP relay to send emails directly to Microsoft 365 or Office 365 from a third-party hosted service, such as Microsoft Azure.
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