I am unable to receive mails from my gmail account

I am unable to receive mails from my gmail account

Hello Zoho,

I r ecently set up zoho account, using old domain kukdukoo.com. MX records are set up as per instructions.  I'm getting mails from zoho accounts but NOT from Gmail. I am also able to send emails from zoho to gmail. Please address my issue.  Can anyone let me know what I've missed out!