ActionView::Template::Error: Missing host to link to! Please provide the :host parameter, set default_url_options[:host], or set :only_path to true
问题 My ruby on rails action mailer runs all good in development environment, but in production environment, it keeps throw: ActionView::Template::Error: Missing host to link to! Please provide the :host parameter, set default_url_options[:host], or set :only_path to true My development config is config.action_mailer.delivery_method = :smtp config.action_mailer.smtp_settings = { :port => xxx, :address => 'smtp.example.org', :user_name => 'xxx@example.com', :password => 'xxxxxxxx', :domain =>