For the moment, I can only suggest registering with an alternative email address, such as an @gmail.com one, if you have one. Apologies for the inconvenience.
This is because Microsoft's email servers apparently hate us. I don't know why. We don't appear to be on any public email blacklists that I've found, and I've no evidence our server has inadvertently become a spam source or anything. I'm not aware of such trouble with other domains. I've not found any concrete steps I can use to diagnose the problem further.
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<email@example.com>: host mx3.hotmail.com[220.127.116.11] said: 550 SC-001
(SNT004-MC6F10) Unfortunately, messages from 18.104.22.168 weren't sent.
Please contact your Internet service provider since part of their network
is on our block list. You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors. (in reply to MAIL