class ProcMailer < ActionMailer::Base default to: 'system@test.lindsaar.net', 'X-Proc-Method' => Proc.new { Time.now.to_i.to_s }, subject: Proc.new { give_a_greeting }, 'x-has-to-proc' => :symbol def welcome mail end private def give_a_greeting "Thanks for signing up this afternoon" end end