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I've read this article regarding Send mail from Multiple devices/application
Option 1 is the MS 'Recommended' one - but then there's this kind of "disclaimer" in the bottom:
"If you happen to have an on-premises email server, you should seriously consider using that server for SMTP relay instead of Office 365"
Why should one "seriously consider" this? - what's 'wrong' with option 1?
In this related article https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/how-to-configure-iis-for-relay-wi...
Are the IIS option considered as the 'best solution' in 'relaying' towards O365?
Looking for the 'Best' solution possible - security-wise
10-13-2019 11:03 PMSolution