The IP address of a VPS I use for web and email hosting was blocked by hotmail on the 10th of February 2014. The smtp error code quoted in the Mail Delivery Failed email, from hotmail, was 550 SC-001 (COL0-MC3-F51). The VPS manager requested that the IP be unblocked by hotmail, however it is still blocked.
What can be done to get this resolved quickly?
Thanks in advance