config mail in production (herokuapp)

config/environments/production.rb

 Rails.application.configure do
 Rails.application.configure do
+  config.action_mailer.smtp_settings = {
+    address: 'smtp.gmail.com',
+    port: 587,
+    domain: 'venjob-anhtn.herokuapp.com',
+    authentication: 'plain',
+    enable_starttls_auto: true,
+    user_name: ENV['GMAIL_USERNAME'],
+    password: ENV['GMAIL_PASSWORD']
+  }
+
+  config.action_mailer.default_url_options = { host: 'venjob-anhtn.herokuapp.com' }
+
   # Settings specified here will take precedence over those in config/application.rb.
   # Settings specified here will take precedence over those in config/application.rb.
 
 
   # Code is not reloaded between requests.
   # Code is not reloaded between requests.