DNS Record not Found

DNS Record not Found

We are unable to receive emails and after troubleshooting, this is the outcome when queried using the mxtoolbox website:
      We did not find a DNS record published for this domain or hostname.

Domain was registered on zoho and we have accessed the domain manager at the url: rr-n1-tor.opensrs.net to ascertain that name servers are configured and IP assigned.
The assigned IP can be reached but the domain cannot be resolved to the IP address.

HELP!