Redmine 2.1.2 no email notifications being sent. SMTP, no TLS, auth: none

I am in the process of migrating my legacy Redmine 1.1.x running on Bitnami stack to Bitnami Redmine 2.1.2. The site is up but no email notifcations are being sent.

The configuration.yml has the following entry. Is this correct? Is :none for auth still an option?

email_delivery:
    delivery_method: :smtp
    smtp_settings:
      tls: false
      address: my.domain.com
      port: 25
      domain: my.domain.com
      authentication: :none
      user_name: ""
      password: ""