I'd like them to publish their roll out plan and how everything was configured. Could be a possible security risk, but the know how would be valuable for others thinking of the same thing.

If there was an alternate email system which each email had a price USD$0.20c, it would cost too much to spam out. Internal email would be free, but as soon as it leaves your organisation you would get a bill. Or, just scrap the worldwide email system and build another from the ground up, with billing and some sort of banning / server authentication.