https://mailphantom.com/
Copy and past from the site: ######### The use of unique password are considered best practice, why are we not doing this with email addresses as well. MailPhantom aims to achieve this, with an added benefit, you'll see which service providers or mailing lists are sharing your email addresses. #########
This is basically a MVP, and may likely break somewhere. But if there is a lot of interest I may build/work on it more. I have used it in its current state for a few months now.
I welcome any feedback :)
^C