Mail blocked through Zoho

Mail blocked through Zoho

Hi,
I started getting this message from undelivered emails tonight.
ALL emails I try to send from my business address get this. My other email addresses work fine (live.com) so it's not the ISP address.

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. 

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. 

<redacted>@optusnet.com.au INVALID_ADDRESS, ERROR_CODE :521, ERROR_CODE :5.7.1 <redacted>@optusnet.com.au>: Recipient address rejected: You are not allowed to send mail. Please see http://www.spamhaus.org/query/bl?ip=74.201.84.154 if you feel this is in error. (127.0.0.2) 

Here is the problem, it seems.
https://www.spamhaus.org/sbl/query/SBL293648#removal