actionmailer and exchange

Question

I am trying to set up my client's mail in my app but getting nowhere...

I can access the email on oulook web access via:

https://remote.networkrunners.com
username: ghi\<username>
password: pwd

My development.rb looks like this:

config.action_mailer.raise_delivery_errors = true
config.action_mailer.perform_deliveries = true
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
  :domain             => "remote.networkrunners.com",
  :address            => "mail.networkrunners.com",
  :port               => 25,
  :authentication     => :login ,
  :user_name          => 'ghi\<username>',
  :password           => 'pwd',  
}

I've tried numerous trial and error methods to the settings but am getting nowhere.

Is there something extra I should be adding to configs?

Error I am getting is: Execution expired