What does account or trap type (Grey, Pristine) mean?

A pristine spam trap is an email account that is not previously known to have existed as a real user account.

A grey spam trap (or recycled spam trap) is an account that has previously existed as a real user or real domain, but for the time frame that our data partner has operated it, it no longer represents a real user or real domain.

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Glossary 135 common email marketing and deliverability terms