# File lib/mail/matchers/has_sent_mail.rb, line 73
      def filter_matched_deliveries(deliveries)
        candidate_deliveries = deliveries

        %w(sender recipients subject subject_matcher body body_matcher).each do |modifier_name|
          next unless instance_variable_defined?("@#{modifier_name}")
          candidate_deliveries = candidate_deliveries.select{|matching_delivery| self.send("matches_on_#{modifier_name}?", matching_delivery)}
        end

        candidate_deliveries
      end