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Will there be information provided for non-Exchange gateways? Will EXO also block non-Microsoft transports like barracuda, mimecast, postini, etc. that do mail hygiene, DLP, or other work? Any anticipated side effects for such things, possibly if any of these try to emulate an Exchange server?
What about NLBs? What impact or side effects could those experience as a result?
Right now we are focused on specific versions of Exchange Server in specific configurations. We are always looking for ways to improve the security of our cloud and to help our on-premises customers stay protected. We are initially focusing on email servers we can readily identify as being persistently vulnerable, but we will block all potentially malicious mail flow that we can.