My admin mail id is getting bounced - please help

My admin mail id is getting bounced - please help

Hi Team Zoho

I have created my zohoaaps and now Iam facing an issue in using my one of admin mail ID.
admin@oasesnephro.com
People who try to send mail to this id are getting bounced. All other mail accounts are working fine. Iam not able to fix this issue from my admin login. Please guide me on how to fix this issue.