I'm Not Receiving mails from Gmail & Yahoo mail

Hello,

I used my domain rpm-eg.com & set up Zoho account & emils, but I'm Not Receiving mails from Gmail & Yahoo mail.
Gmail senders got error :

Address not found

Your message wasn't delivered to yasser@rpm-eg.com because the address couldn't be found. Check for typos or unnecessary spaces and try again.

This link will take you to a third-party site

Yahoo error:

Sorry, we were unable to deliver your message to the following address.

Remote host said:

550 5.1.1 < sherif@rpm-eg.com> Recipient not found. < http://x.co/irbounce>

[RCPT_TO]

How can I solve this issue?

Regards
Yasser