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Which websites would you usually check if you suspect that your company's address book has been leaked and is being used by spammers?

I have identified https://pwnedlist.com/ for this purpose but was wondering if there are another alternative(s).

closed as primarily opinion-based by Rory Alsop Nov 22 '14 at 21:57

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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