ERROR_CODE :550, ERROR_CODE :"JunkMail rejected - sender1.zohomail.com [74.201.84.155]:29615 is in an RBL

ERROR_CODE :550, ERROR_CODE :"JunkMail rejected - sender1.zohomail.com [74.201.84.155]:29615 is in an RBL

Can't send mail to one of my clients, this is getting to be a extremely annoying and inconvenient email so far.

"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. 

fxx@intermetal.cl  Invalid Address, ERROR_CODE :550, ERROR_CODE :"JunkMail rejected - sender1.zohomail.com [74.201.84.155]:29615 is in an 
            RBL, see blocked, See:  http://www.spamcannibal.org/cannibal.cgi?page=lookup&lookup=74.201.84.155"  "