Sample interceptor to interrupt outbound emails in non-production environments.

gistfile1.rb

# put this in lib or a gem or something
class NonProductionInterceptor
  def self.delivering_email(message)
    # implement some mechanism to strip non-example.com and non-tstmedia.com email
    # addresses from the delivery lists. also verify that if no delivery emails are
    # left, either drop the email (if possible) or add nobody@example.com or some
    # other dummy address so no exception is raised when attempting to deliver.
    # 
    # Feel free to crib from TstMailer, of course.
    # 
    # Also, this example seems to be a good fit: http://renderedtext.com/blog/2012/04/27/filtering-emails-on-staging/
  end
end

# put this in an initializer
Mail.register_interceptor(NonProductionInterceptor) unless Rails.env.production?