There are a bunch like AliExpress, eBay, Paypal and kickstarter where 3rd parties get your email address too (or used to), so you don't know which one leaked them. I tend to change the email address every few years when it gets too much and block the old ones after a while.

I suspect that most of the entries on the list got hacked. There are a few exceptions where companies do not honor unsubscribe requests and keep sending you emails or flat out sell your email address.

Here's a list that was collected over many years:

- Cory Doctorow's mailing list (twice)

- bitcard

- Achatzi, CSV direct, easynotebooks, foto-erhard, hivilux - (german online shops)

- dcemu, gbadev

- Dropbox

- funcom

- gawker

- Kimsufi and OVH

- GoodLuckBuy

- Mails listed in WHOIS

- Mails used in Yahoo groups (RIP)

- MiniInTheBox

- monster.com

- moneybookers

- pianostreet

- Usenet (duh)

- Typepad

- UnternHammer