Help I am going nuts with this set up!!

Help I am going nuts with this set up!!

I have set up a domain based email with ZOHO, however, no matter how I try or what configuration of MX I enter I still cannot receive emails into ZOHO.  I can SEND email from ZOHO and they are received but I cannot capture anything inbound.  I have tried every set up known to man and have even invented a few but still nothing.  PLEASE help!