I am getting the following error when I send an email to Hotmail from my server.
Remote Server returned: '550 5.7.1 Unfortunately, messages from [75.150.xxx.xxx] 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 http://mail.live.com/mail/troubleshooting.aspx#errors. [VE1EUR01FT058.eop-EUR01.prod.protection.outlook.com]'
Thanks for taking the time to reach out to us through our business forums. I am so very sorry for the delay in our response. I know how important email services are to your business and I would love to help you get to the bottom of this. Can you please reach out through private message with your first and last name, full service address and account number or phone number?