Bounce s3140

Question

Hello,
Those IP were Bounced for reasons unkown to us even though we always follow best practices.
Therefore we would like an explanation to this suspension and we urge you to unlook our ip as soon as possible
Thank you and have a great day.
Erreur
Error: "550 5.7.1 Unfortunately, messages from [IP] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3140). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [CO1NAM11FT042.eop-nam11.prod.protection.outlook.com]" while connected from [DOMAIN] ([IP]) to hotmail-com.olc.protection.outlook.com (104.47.56.161)

Answer 1

You will need to seek help from:
https://answers.microsoft.com/en-us/outlook_com/forum?sort=LastReplyDate&dir=Desc&tab=All&status=all&mod=&modAge=&advFil=&postedAfter=&postedBefore=&threadType=All&isFilterExpanded=false&page=1

This forum does not handle outlook.com / Live.com support issues.