Outlook protection is shit!
Microsoft is blocking our company mail server AND even my private one for a couple of days now for no reason.
Every other mailing black list has nothing to complain but Microsoft: "You want to send a very important mail to your customer? Nope!"
And
"Yeah, now you tried to use your private server to fool me. Haha, nope! You didn't think I would block IPs randomly, did you?"

Fuck Microsoft! Fuck Outlook protection! Fuck hotmail!