Redmine

HI Team , When i click the send test mail using my admin ID am getting the below error
An error occurred while sending mail (535 Incorrect authentication data );
Please help me on this.
My redmine version:redmine-2.4.2-0
My Configuration.yml file details below:

1. default configuration options for all environments
   default: # Outgoing emails configuration (see examples above)
   email_delivery:
   delivery_method: :smtp
   smtp_settings:
   ##tls: true
   ##enable_starttls_auto: true
   openssl_verify_mode: 'none'
   address: *
   port: 587
   domain:
   authentication: :plain
   user_name: noreply@kovaion.com
   password: **

##config.action_mailer.perform_deliveries = true

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please help on this.