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Recycled Traps & Moles
Email addresses that once belonged to a user, but have since been abandoned or closed. They are then reactivated at a later date and monitored to see who is still emailing to that address. The idea behind these addresses is not only to catch spammers but also to catch email marketers sending to unengaged subscribers.
For more information on individual blacklist operators, please see our extensive blacklist knowledgebase.