Prevent paths in mails (ActionMailer)

It happens once in a while, a path gets into a mail, but with this patch it should happen nevermore.

Looks for paths in non-production and raises if it finds one.

unless Rails.env.production?
  class ActionMailer::Base
    def render_message_with_path_protection(method_name, body)
      body = render_message_without_path_protection(method_name, body)
      if body =~ %r{((href|src)=['"]/.*)}
        raise "Use absolute path in mail urls! #{$1}"

    alias_method_chain :render_message, :path_protection

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