Hi I'm seeing an extreme amount of SMTP authentications (over 600/s) from the microsoft owned 40.101.0.0/16 range on my customer SMTP servers. It's just auth, with valid credentials, and then it disconnects right after so no attempts to send any mails have been done for the vast majority of these connections. A small amount of valid mails are being sent from this range though. HELO indicates it's from outlook.com. So seems like their system for sending with your own domain through external servers has gone a bit haywire...
I've sent ab...@microsoft.com a mail about it, but I'm a bit curious if anyone else is seeing the same? -- BR/Mvh. Dan Malm, Systems Engineer, One.com
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