Rails 4 Mailer在生产Digital Ocean服务器中不起作用

Question

我的应用程序中有一个简单的联系表单，该表单使用我的Gmail帐户将电子邮件发送到另一个Gmail帐户。 由于某种原因，它在开发中完美地发送了邮件，但在生产中却没有。 我将自己的网站托管在DigitalOcean一键式Rails应用程序中。 当我尝试以实时版本发送邮件时，网站挂了一段时间，并显示“很抱歉，出了点问题。”

的Gemfile

#Mailer
gem 'mail'

development.rb

Rails.application.configure do
  # Settings specified here will take precedence over those in config/application.rb.
  config.cache_classes = false
  config.eager_load = false
  config.consider_all_requests_local       = true
  config.action_controller.perform_caching = false
  config.action_mailer.raise_delivery_errors = false
  config.active_support.deprecation = :log
  config.active_record.migration_error = :page_load
  config.assets.debug = true
  config.assets.digest = true
  config.assets.raise_runtime_errors = true

  config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
  config.action_mailer.perform_deliveries = true
  config.action_mailer.raise_delivery_errors = true
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.smtp_settings = {
    :address              => "smtp.gmail.com",
    :port                 => 465,                
    :user_name            => 'foo@gmail.com',
    :password             => 'foo',        
    :authentication       => :login,
    :ssl                  => true,
    :tls                  => true,
    :enable_starttls_auto => true
  }
end

production.rb

Rails.application.configure do

  config.cache_classes = true

  config.eager_load = true

  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true

  config.serve_static_files = ENV['RAILS_SERVE_STATIC_FILES'].present?

  config.assets.js_compressor = :uglifier

  config.assets.compile = false

  config.assets.digest = true

  config.log_level = :debug

  config.i18n.fallbacks = true

  config.active_support.deprecation = :notify

  config.log_formatter = ::Logger::Formatter.new

  config.active_record.dump_schema_after_migration = false

  config.action_mailer.default_url_options = { host: 'foo.com.mx' }
  config.action_mailer.perform_deliveries = true
  config.action_mailer.raise_delivery_errors = true
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.smtp_settings = {
    :address              => "smtp.gmail.com",
    :port                 => 465,                
    :user_name            => 'foo@gmail.com',
    :password             => 'foo',        
    :authentication       => :login,
    :ssl                  => true,
    :tls                  => true,
    :enable_starttls_auto => true
  }
end

Answer 1

我从服务台获得了答案，您可以通过取消注释该行，在etc/gai.conf文件中通过将IPv4优先于IPv6来解决此问题。

#precedence ::ffff:0:0/96 100

其背后的原因是，默认情况下，Digital Ocean会阻止通过IPv6的传出SMTP请求。