I've been using Missinglettr for 2-3 years with good results, so I'm familiar with the company as well as the developer. When he announced Postbox a few months ago, I jumped on it sight unseen, based on my experience, even though I didn't have all the details.

I'm buying "more" of Postbox here on Appsumo, because I didn't get enough initially – the product is that good. And I'm very glad to see it here because the more users it has, the more powerful it is for everybody.

You may have used similar software, such as Thunderclap and Quuu Promote. If you're not familiar with the concept of what it does, it basically takes your message/link and spreads it via a network of other members. They help others by sharing your quality content and you get access to their audiences.

Postbox does a good job of putting your content in front of the right people to share it and also gets the right content in front of you. There is a "quality score" that helps maintain good standards and helps make sure that anything you share is worthwhile – this is one of the big differences between Postbox and other "thunderclap"-type services. Nobody wants to have to weed through a bunch of spam to get to the good content and Postbox helps make sure you don't have to. This keeps users successful and will keep them using this service.

If you have good content to share, you will be successful with Postbox and it will help you get your content out to new people in a big way. And as I mentioned, the more users it has, the more powerful it is, so it's only going to get better as far as helping you to reach the right people with your message.

The developer is great and there is a good community behind this product. He is responsive to questions and new ideas. Since having this product, there has already been some big improvements, which I expect will continue.

I hope AppSumo continues to bring high-quality deals like this.