my server is not able to send msgs to hotmail
SMTP error from remote mail server after MAIL FROM: SIZE=2772:
host [url removed, login to view] [[url removed, login to view]]: 550 SC-001 (SNT0-MC2-F26) Unfortunately, messages from 66.226.**.** 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 [url removed, login to view]
How to fix it?