Rails 4 Test SMTP Settings for ActionMailer

email_test.rb

# Sometimes it's necessary to perform a test of new SMTP settings.
# Should be run from within the rails environment.
# Tested with Rails 4.0.2

ActionMailer::Base.smtp_settings = {
  address:              ENV['MAILER_ADDRESS'],
  domain:               ENV['WEB_HOST'],
  port:                 ENV['MAILER_PORT'],
  user_name:            ENV['MAILER_USER'],
  password:             ENV['MAILER_PASSWORD'],
  authentication:       'login',
  enable_starttls_auto: true
}

class TestMailer < ActionMailer::Base

  default :from => ENV['MAILER_USER']

  def welcome_email
    mail(:to => ENV['MAILER_TEST_RECIPIENT'], :subject => "[#{Time.now}] Test Email", :body => "Test mail body from #{Time.now}.")
  end
end