Undelivered mail returned to sender - domain dcs.discovery.co.za

Undelivered mail returned to sender - domain dcs.discovery.co.za

Good day,


I sent a number of email yesterday of which all addressed to domaindcs.discovery.co.za were returned as undeliverable.

Would that mean the Discovery server is blocking my Zoho messages? Please advise.

Thank you,

Corne Dippenaar