My ActionMailer configuration

application.rb

    # ActionMailer data
    config.action_mailer.delivery_method = :smtp
    config.action_mailer.smtp_settings = {
        :address              => "smtp.gmail.com",
        :port                 => 587,
        :domain               => "mydomain.com",
        :user_name            => "my.sender.address@gmail.com",
        :password             => "my_google_autogenerated_password",
        :authentication       => "plain",
        :enable_starttls_auto => true
    }