One of my teamates uses email that is refused when i try to send to him. Here is the result:
INVALID_ADDRESS, ERROR_CODE :550, ERROR_CODE :"JunkMail rejected - sender-of-o53.zoho.com [135.84.80.218]:21704 is in an
RBL: Listed in ZapBL, see
https://zapbl.net/lookup?135.84.80.218"
It seems that zoho IP is blacklisted. What can i do to solve this?