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我正在使用Devise on Rails,我想知道是否有一个钩子或过滤器可用于向Devise的用户注册过程添加一些代码,并在创建帐户后向用户发送欢迎电子邮件.如果没有设计,那将是这样的......

  respond_to do |format|
      if @user.save
        Notifier.welcome_email(@user).deliver    # <======= 
  ...   

我有一个问题,让sendgrid成功地在rails 3.1应用程序上发送电子邮件,该应用程序使用authlogic进行身份验证并部署在heroku上.我在config/environments/[development.rb和production.rb]上有以下动作邮件配置:

config.action_mailer.delivery_method = :smtp
config.action_mailer.default_url_options = { :host => 'localhost:3000' }
config.action_mailer.default_charset = "utf-8"
config.action_mailer.raise_delivery_errors = true
config.action_mailer.perform_deliveries = true
config.action_mailer.smtp_settings = {
  :address => 'smtp.sendgrid.net',
  :port => 587,
  :domain => ENV['SENDGRID_DOMAIN'],
  :user_name =>  ENV['SENDGRID_USERNAME'],
  :password => ENV['SENDGRID_PASSWORD'],
  :authentication => 'plain',
  :enable_starttls_auto => true
}

    config.action_mailer.default_url_options = { :host => [app name in heroku] }

    Completed 500 Internal Server Error in 21740ms
    Net::SMTPFatalError (550 Cannot receive from specified address notification@[app-domain]: Unauthenticated senders not allowed
):