OUTLOOK 2016 SEND MAILS ARE NOT GOING ?

OUTLOOK 2016 SEND MAILS ARE NOT GOING ?

Hi

We have recently configured our mails on Zoho , But outlook is not working properly.
On configuring outlook with Zoho we are getting this error. 
Despite following all the other previous steps. 

Zoho Mail : midhun@hefa.co.in

I am recieving the send mails in inbox, but when i send a mail it goes to outbox

Please fix the same.

Regards

Midhun
+91 9739512308