On 28 March 2023 16:32:42 Tobias Fiebig via mailop <mailop@mailop.org> wrote:
https://techcommunity.microsoft.com/t5/exchange-team-blog/throttling-and-blocking-email-from-persistently-vulnerable/ba-p/3762078
This only affects Exchange Online customers with a hybrid setup, i.e. one where they have an on-premises Exchange server tied into their EOL environment.
At $dayjob, that's our current setup. Exim talks to and from the outside world, delivers to local Exchange, delivers to EOL (and the same IV reverse). We are however in the process currently of removing the local Exchange servers from the path. Ultimately the Exim end will disappear too... which means I'll be doing something new!
MS know what version and update level the local servers have because they're in an Exchange Organisation with EOL so share data each way.
So there's nothing nefarious here, just MS enforcing zero trust and best practice on their customers.
Graeme
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