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# app/mailers/your_mailer.rb

class YourMailer < ActionMailer::Base
  def email_name
    mail :subject => "Mandrill rides the Rails!",
         :to      => "recipient@example.com",
         :from    => "you@yourdomain.com"
  end
end

# In a controller: YourMailer.email_name.deliver

# 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