Can send emails from 1 iphone but not the other

Can send emails from 1 iphone but not the other

I am really struggling with my new iphone settings when it comes to sending email. I have two iphones and I copied settings in my new iphone from the old phone. I can send emails from old phone still but it just doesn't allow me to do so from new phone - always saying sending the message content to the server failed. I was meticulous in copying settings and account was verified. Any other possibilities

Ash

PS: the username and password in smtp outgoing server settings is myname@mydomain.com, pwd relates to my zoho account. I hope that is correct