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Rails::Initializer.run do |config| # other stuff ... config.after_initialize do if config.frameworks.include?(:action_mailer) and RAILS_ENV != 'test' smtp_config_file = File.join(RAILS_ROOT, "config", "mailer.yml") if File.exist? smtp_config_file settings = YAML::load(ERB.new(File.read(smtp_config_file)).result) config.action_mailer.smtp_settings = (settings[RAILS_ENV] || {}).symbolize_keys end end end end

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