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Undelivered Mail Returned to Sender (Microsoft mails)

29/12/2013, 13h24
Microsoft doesn't blacklist your ip but some range of ip .....
you can try to contact microsoft through the snds service.

29/12/2013, 10h33

I recently bought a Kimsufi Dedicated Server, and my problem is that I can't send mails to Microsoft mail, like hotmail, windowslive or outlook.
I can send mails without any problem to other hosts! I think the IP is blacklisted, but I don't know why.

This is the error what I get:
Reporting-MTA: dns;
X-Postfix-Queue-ID: 6204E401D16
X-Postfix-Sender: rfc822;
Arrival-Date: Sun, 29 Dec 2013 00:06:48 +0100 (CET)

Final-Recipient: rfc822;
Action: failed
Status: 5.0.0
Remote-MTA: dns;
Diagnostic-Code: smtp; 550 SC-001 (COL0-MC3-F15) Unfortunately, messages from
    94.23.x.x 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
I have to contact Microsoft or you can fix this issue?

Best Regards,