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Will this block e-mails from external Exchange servers as well? For example: a customer has on-prem Exch 2010 which sends e-mail directly outbound and his/her customer using EXO.
- According to Scott in a similar question, no. They are starting with hybrid-connected servers first. Much later it sounds like they might include non-hybrid exchange servers, but only for ones related to the tenant. Customers send to another customer at O365 don't seem to be in-scope for this now or in the future (yet).
- Eventually, all unpatched and unsupported Exchange Servers will be in scope.
- Yes, eventually those servers will be in scope, too. Exchange 2010 is unsupported and should no longer be used.
- Well, that seems counter to my similar question yesterday. I thought the tracking was only between tenant related servers (e.g. my on-prem server sending to my tenant)?
- No; it does not matter who in Exchange Online is the recipient. We're blocking messages from persistently vulnerable Exchange Servers no matter who they are sent to.
