I've run my own email server for quite a few years and that's still a tough question to answer. I have thought about creating a few email accounts to test that

I've run my own email server for quite a few years and that's still a tough question to answer. I have thought about creating a few email accounts to test that though, but still not done it. It would be pretty easy to test that by setting up an email server with a few accounts and make a list of sites you entered those email addresses on. If you entered those email address for just one site you'd nail down the first few they sold your email address to at least and could track who it spread to since. Mail-in-a-Box makes it pretty easy to set up an email server. It's tough to get a clean IP that's not on a blacklist but you wouldn't have to worry about that. It will receive mail from any IP unless you block it.