Chiming in with a "me too" but from Microsoft's Outlook cloud environment.
Connection gets made, TLS handshake, then nothing from all corners of the Azure
cloud both IPv4 and IPv6. I cannot receive any mail from Microsoft anymore.
This has been happening here for a few months now. My own MTU is 1500, no
VLAN's, tunnels or other stuff in there that would eat bytes from that. I'm now
running a secondary MX from a different network, essentially the same setup but
works just fine.. I'm completely stumped.
Bas
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