Prevent "__@zoho.com on behalf of" when sending from hosted domain

Prevent "__@zoho.com on behalf of" when sending from hosted domain

Sending from an email address on my hosted domain, I recieve "__@zoho.com on behalf of ...." as the sender in outlook.

This happens when I send from my administrator account, using me@mydomain.com as the email address. However, it does not happen when I send from me@myotherdomain.CA.

How can I get email sent from me@mydomain.com to behave me@myotherdomain.CA?

Thanks,

Tim