Redmine

I've setup my email.yml file to contain the following:

# Outgoing email settings

production:
  delivery_method: :sendmail
  sendmail_settings:
    location: /usr/sbin/sendmail
    arguments: -i -t
    address: smtp.example.net
    port: 25
    domain: example.net
    authentication: :none
    user_name: redmine@example.net
    password: redmine

when i click "Send a test email" the following message that appear on the top of the panel

An email was sent to mymailaddress@hotmail.com

then i check in hotmail and waiting for along time but there 're no receive email.
somebody help me , welcome all advices.