action_mailer settings for gmail

development.rb

# Don't care if the mailer can't send
  config.action_mailer.raise_delivery_errors = false
  config.action_mailer.default_url_options = { :host => 'localhost:3000' }
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.perform_deliveries = true
  config.action_mailer.raise_delivery_errors = false
  config.action_mailer.default :charset => "utf-8"
  config.action_mailer.smtp_settings = {
    address: "smtp.gmail.com",
    port: 587,
    domain: "localhost:3000",
    authentication: "plain",
    enable_starttls_auto: true,
    user_name: "my-gmail-user",
    password: "my-gmail-pass"
  }