My domain name is janelaaj.clinic. I'm using zoho as email service provider. My problem is when I trying to send email from gmail account to my zoho email ID( admin@janelaaj.clinic) it bounce back with failure message but its working for other accounts (like outlook,etc).

Failure message:

      " 550 Please turn on SMTP Authentication in your mail client. mail-lf0-f44.google.com [209.85.215.44]:36988 is not permitted to relay       through this server without authentication." 

I did follow all the steps to setup zoho email service with my domain. I checked MXLOOKUP too from  www.mxtoolbox.com and the result returned ZOHO as host name.