I recently configured Zoho mail to be my e-mail client.   The send appears to be working, I sent several e-mails and they all arrived to the correct addresses.  However e-mails sent to me are still going to my old Outlook account.  My domain is hosted with GoDaddy, I've configured the MX records per the instructions and used MXToolBox to verify.   There is one error message that reads for SMTP "Reverse DNS does not match SMTP Banner".  

Is that the problem and, if so, how do I fix it?  

Thank you,

Jack