[abhinavg]

I'm a happy duck.com address user. I can answer these questions:

What it is: It gives you private throwaway email addresses. Instead of signing up for a website with <real>@gmail.com, use <fixed>@duck.com. It will forward the email to <real>@gmail.com after removing any trackers from it. It also lets you generate <random>@duck.com addresses on demand. If you sign up for something with <random>@duck.com, and they start spamming you, you can turn the email address off without doing anything to <real>@gmail.com or <fixed>@duck.com.

How to re-access it: Information about your duck.com address is stored in that browser. If you use the Browser extension, that remembers it. You simply need to log into that email address from your current browser. To do this, visit https://duckduckgo.com/email/, click on "I already have a Duck address", and enter your original <fixed>@duck.com address. It will email you a one-time password to <real>@gmail.com, and you'll be back in again.