SMTP for ZOHO does not work on my iPhone 6

SMTP for ZOHO does not work on my iPhone 6

I am consistently unable to use my iPhone 6 to send email through my personal domain name hosted by ZOHO. I get an error message: Cannot Send Mail / The user name or password for "SMTP:jim@ [domain name] @smtp.zoho.com" is incorrect.  I have repeatedly re-entered the user name and password in Settings, but I always get the same result.  There is no problem using Outlook on my desktop to send email from this account.  I can receive POP mail for this account on my iPhone with no problem.  It is just sending that doesn't work. 

Copies of the error message screen and my SMTP account settings screen are attached.  

Any help would be very much appreciated!!!