Emails are being blocked by hotmail

Emails I am sending are being blocked by hotmail.

Here is the mail log error message:

to=<>,[]:25, delay=0.15, delays=0.01/0.01/0.1/0.04, dsn=5.7.1, status=bounced (host[] said: 550 5.7.1 Unfortunately, messages from [] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to [] (in reply to MAIL FROM command))
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it’s a new server. but it’s already blocked by hotmail, microsoft outlook

I’m trying my luck with

Not hoping on it though - this seems like a larger issue for DigitalOcean to resolve - MS blocking entire DO IP ranges due to the amount of (spam) misuse coming from DO.

I have the same problem. The server’s ip is new. My server meets all security specifications and still hotmail blocks the ip. I tried to communicate with them but I don’t get any answers.