I was wondering who here has built smtp inbound or outbound relay servers for there exchange infrastructure? If you've built these relays how have they performed and what version of windows did you ...

Subject does most of the work here, but I'll expand. [edit] Maybe if I had just RTFM'd harder I would've found my answers... I think this will help, but leaving the post up in case anybody else has ...

Microsoft has shared updated requirements for SMTP relay via its Exchange Online platform. The new updated requirement is not applicable yet and is set to roll out towards the end of the year.