Server IP 135.84.80.196 listed as abusive

Server IP 135.84.80.196 listed as abusive

During the last days we have problems sending emails with Zoho to some specific adresses (Email domain
sumax.de). When we send to this domain, we get emails back from mailer-daemon@mail.zoho.com such as

E.g. at (Montag, 20. November 2017 12:55)

This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error.


rg@XXX INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :5.7.0 Server IP 135.84.80.196 listed as abusive. See http://spamauditor.org/best-practices/ip-reputation/ for more information. Protection provided by MagicSpam 2.0.12-1 http://www.magicspam.com


Can you please advise?