Forget about it and never come back and read it. Everyone's done that with email. It's easy to do because it's not a physical piece of mail sitting around requiring attention. And, as long as your mail piece isn't coming back to you, you can be pretty sure that it got through. What happens when people go to their mailboxes? Most of the time they bring the mail into the house and they sort it into piles. Pile 'A' is stuff they go through immediately. There's usually a 'B' pile for the bills.
Pile 'C' and pile 'C' is full of the Executive List advertisements, postcards and all the other marketing material that they're pretty sure they don't want. That pile gets set down on the counter or in a basket, but basically the person has to eventually come back to the pile. They come back to the pile to make sure nothing important got added to it and to be sure it's garbage. What ends up happening if they didn't open your mail the first time is your mail piece gets a second chance.
pick it up one more time. This time giving it a good look over and maybe they decide at that point they should keep it. Are you still convinced that direct mail is old school? If you're not convinced, then you might want to look at some of the Fortune 500 companies like American Express, Hewlett Packard and so many more. Every one of them uses direct mail as part of their mark There is frontier mentality about media. The newest, latest and greatest is usually the cheapest.