A client of mine is having problems sending emails to @hotmail and @live email addresses from their domain.
They have a job system running on a dedicted virtual server at HYVE and it's sending email from LOCALHOST I have been told.
The bounce back emails are:-
Diagnostic-Code: smtp;550 SC-002 (BAY0-MC3-F19) 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
The job system has been developed by ColdFusion