SpamHaus.org? Emails getting rejected

I am getting some of my emails rejected when I send them. They are in my address book and have sent to them many times before. Getting the message below back.

Reason: Rejection greeting returned by server

Diagnostic code: smtp;554 p3plibsmtp03-08.prod.phx3.secureserver.net bizsmtp IB104. Connection refused. 17.133.164.161 is listed on the Spamhaus Block List (SBL). <http://www.spamhaus.org/query/ip/17.133.164.161> Please visit http://www.spamhaus.org/sbl/ for more informa

Remote system: dns;smtp.secureserver.net (TCP|17.133.164.161|63248|68.178.213.203|25)