I see that there has been an update to the system. However I have three domain email addresses that usually forward emails to my Apple Mail, I am still able to receive emails, but can no longer send them through Mail. 

Could you please tell me how to fix this problem? as I need to send emails and it is not ideal having to log-in to the online Zoho email system.

I get the message: "The sender address 'blablabla@example.co.nz' was rejected by the server smtp.zoho.com.

Select a different outgoing mail server from the list below or click Try Later to leave the message in your Outbox until it can be sent."

Thanks very much,

John