I'm seeing an extreme amount of SMTP authentications (over 600/s) from
the microsoft owned 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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