Track the sale of addresses to spammers

Recently they sent an offer to sell the base of addresses of my workplace (I, of course, refused to sell). And on microhabra read that not only sent me like . That is, most likely, the proposal was sent to new services, which have already gained their users. But someone may have agreed.

In this regard, I had the following idea, which will allow to kill two birds with one stone:
1. Identify sites that merge their bases
2. To provide reliable sites with something like a “certificate of reliability”

The idea is actually simple: we create unique addresses for each site, for example: bob123@example.com and register it on the test site. Then this business can be automated, store the database (the site is a registered email). As soon as spam came to the box, everything is clear. If the box is empty - the site is reliable.
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For users, you can create a simple website where you can go and check the URL. Then you can create a plugin for ff, opera, etc. I went to the site, in the corner a green check mark - yeah, you can curse. Red - close the window :)

Perhaps the idea is not new, but I don’t remember a similar implementation.

UPD: moved to "Spam (and antispam)"