Hook up Mandrill with Ruby on Rails. http://help.mandrill.com/entries/21738467-Using-Mandrill-s-SMTP-integration-with-Web-Frameworks

production.rb

# production.rb, test.rb, development.rb or application.rb

YourApp::Application.configure do
  config.action_mailer.smtp_settings = {
    :address   => "smtp.mandrillapp.com",
    :port      => 25, # ports 587 and 2525 are also supported with STARTTLS
    :enable_starttls_auto => true, # detects and uses STARTTLS
    :user_name => "MANDRILL_USERNAME",
    :password  => "MANDRILL_PASSWORD", # SMTP password is any valid API key
    :authentication => 'login' # Mandrill supports 'plain' or 'login'
  }

  # …
end

your_mailer.rb

# app/mailers/your_mailer.rb

class YourMailer < ActionMailer::Base
  def email_name
    mail :subject => "Mandrill rides the Rails!",
         :to      => "[email protected]",
         :from    => "[email protected]"
  end
end

# In a controller: YourMailer.email_name.deliver