It is blacklisted on the following:

dnsblchile.org

Project Honey Pot (http:BL)

RFC-Clueless (RFC²) Metalist RBL

RFC-Clueless (RFC²) postmaster RBL

s5h.net RBL

Spam Grouper IP only list

Spam Grouper Net block list

SpamCannibal

UCEPROTECT Level 1

On attempting to do something about it, some of the sites told me that only postmaster@zohomail.com was authorized to report anything, so I have posted on here hoping you can do something