My complaint:

Vandaag werden via UPC verstuurde e-mails geweigerd door hotmail server:
Reporting-MTA: dns; viefep12.chello.at
Arrival-Date: Tue, 23 Jul 2013 11:21:42 +0200
Received-From-MTA: dns; edge02.upcmail.net (192.168.13.237)

Final-Recipient: RFC822;
Action: failed
Status: 5.1.1
Remote-MTA: dns; mx2.hotmail.com (65.55.92.136)
Diagnostic-Code: smtp; 550 SC-004 (SNT0-MC1-F44) Unfortunately, messages from 62.179.121.32 weren’t sent. We recommend that you contact your Internet service provider. The problem is that too many unwanted messages have been sent from the following IP address above. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.

Desired solution:

UPC mailserver niet meer blacklisted.