Microsoft Office 365 is a Software as a Service (SaaS) solution that includes Microsoft Office and other services, such as email and collaboration, from Microsoft's cloud server.
You should have your email server where it should have some IP address. Who is your email service provider ? Are you using Microsoft Exchange as email service?
From Google in general search I found the below details which you can ping from Windows Command Prompt and it will give you IP address,
Incoming mail server: outlook.office365.com
Outgoing mail server: smtp.office365.com
Hope this helps!
Regards
Subhajit
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