Unable to connect SMTP server:smtp.zoho.com Reason:Authentication failed:535 Authentication Failed

Unable to connect SMTP server:smtp.zoho.com Reason:Authentication failed:535 Authentication Failed

I am trying to setup zoho smtp for a phpbb forum but it keeps failing and giving error messages.

  1. /adm/index.php

  3. Ran into problems sending email at Line 1579. Response: 535 Authentication Failed 
  4. .
  5. Backtrace
  6. Connecting to smtp.zoho.com:587
  7. LINE: 1096 <- 220 mx.zohomail.com SMTP Server ready April 22, 2017 8:24:08 PM PDT