Help with Email notifications

I am setting up the email notifications and have setup the proper fields in the email.yml.

production:
delivery_method: :smtp
smtp_settings:
address: 10.0.0.15
port: 25
domain: hwr.local
authentication: :login
user_name: redmine
password: redmine

I am running the trunk at version 2669. I try to send the test email and get this error:
An error occurred while sending mail (535 5.7.3 Authentication unsuccessful. )