Office 365 email SMTP relay

Office 365 requires MFA or security defaults these days, which makes SMTP, username, and password not work for emailing from Manager. Microsoft says to use Option 3 here, which would work, but need to know the IPs that the cloud version of Manager sends from. A DNS name might be acceptable for SPF records if there could be one or several IPs that Cloud Manager runs on. Are you able to provide this information? I realize I could set up a mailgun account or something, but it would be a lot simpler to be able to use 365 SMTP relay on my end.