I configured zoho mail with smartlarn.com successfully. It was working well but after adding AWS DNS to my domain where I hosted my web app, Mail service is not working. So I tried to verify again for MX Records, SFP, DKIM but can't verify. Then I deleted my domain from Zoho and added again but Can't verify.

Please suggest how to add my domain.

Domain Registrar: namecheap.com