I have set up my free mail account with Zoho, I can send mail with no problem, but I can not receive any mail. I have changed MX in my domain registrar. 

Any solutions ?

Thanks and Regards,

Harun

SOLUTION : 
I contacted my friend who is in charge of our server and domains, and he said that he did not configure CloudFlare for mail. When he configured it , everything worked fine, as it does now. 

I hope this solution can help others too.