"I’ve been working with many clients who had major deliverability issues. As in zero emails to the inbox due to filtering by overzealous email hosts (I’m looking at you Microsoft) and some regional ISP’s. In each and every case, We Deliver “delivered” on the goods, finally enabling the emails to get through. In one case it saved the client’s business from folding since all her clients were on Microsoft Exchange based systems. It’s not a silver bullet, it’s not a cure-all, it’s not snake oil, it won’t cure baldness, and it won’t solve your problem if you’ve beaten your list to death, if your copy sucks, or your offer is weak, it may just save your business or increase your profits if you’re doing all the right things but your clients are with a bad mail host. I was so impressed with what he did for our clients, that we started using it too."