I created an account, and pointed the mx entries of my custom domain to zoho's mx entries, but this is the error i got:
Delivery to the following recipient failed permanently:
< my personal email from my domain>
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain <
d omain>
by
mx.zohomail.com
. [74.201.154.201].
The error that the other server returned was:
550 5.1.1
< my personal email from my domain>
... User unknown