邮件未发送：使用Ruby on Rails在heroku上发送sendgrid

== config/environment.rb === 
    ActionMailer::Base.smtp_settings = { 
    :user_name => ENV['SENDGRID_USERNAME'],:password => ENV['SENDGRID_PASSWORD'],:domain => ENV['SENDGRID_DOMAIN'],:address => "smtp.sendgrid.net",:port => 587,:authentication => :plain,} 
===

==== config/environments/production.rb === 
    config.action_mailer.delivery_method = :smtp 
    config.action_mailer.raise_delivery_errors = true 
=====

== app/models/notifier.rb == 
    class Notifier < ActionMailer::Base

    include SendGrid 

    default from: "abc@yahoo.com" 
    #sendgrid_category :use_subject_lines 
    #sengrid_enable :ganalytics,:opentrack

    def test_notification 
      mail(:to => "xyz@gmail.com",:subject => "mail from heroku") 
      puts("Sent mail from notifier") 
   end 

   end 
========

我尝试从heroku控制台运行test_notification方法

>> Notifier.test_notification

(这打印出一些日志信息..)

#<Mail:Message:279922420,Multipart: false,Headers: <from..,To,Subject,etc).

但send_grid不会报告从我的帐户发出的任何邮件.我没有收到电子邮件.

我还尝试通过从/ home / index / controller调用test_notification来通过其他方式发送邮件,这将在访问应用程序的主页时发送.

=== 
class HomeController < ApplicationController 
def index 
Notifier.test_notification() 
end

end

===

统计信息不会报告发送的邮件.任何帮助是极大的赞赏.

谢谢！
DS