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What Is a Spam Trap?
TL;DR
A spam trap is an email address planted specifically to catch senders with poor list hygiene — it never opted in and never sends real replies, so any mail sent to it signals to mailbox providers and blocklists that the sender isn’t validating their list properly.
How spam traps work
Spam-trap addresses are seeded by mailbox providers, anti-spam organizations, and blocklist operators. Some are "pristine" traps — addresses that were never used by a real person and only exist to catch senders scraping or guessing addresses. Others are "recycled" traps — real addresses that were abandoned, then reactivated by the provider specifically to catch senders with stale, unmaintained lists.
Because a spam trap never signs up for anything and never legitimately expects mail, receiving even one email to a trap address is a strong signal that a sender’s list-building or list-hygiene process is flawed.
What happens when you hit a spam trap
Hitting a small number of recycled traps occasionally is common and rarely catastrophic on its own. Hitting pristine traps, or hitting traps repeatedly, can get a sending domain or IP blocklisted — which can block delivery to that provider until the sender proves it has cleaned up its practices.
Recovery typically means removing invalid or stale addresses from every list, tightening list-acquisition practices, and in serious cases requesting delisting from the blocklist operator directly.
Avoiding spam traps
The main defenses are the same as good list hygiene generally: verify email addresses before sending, never buy or scrape lists from unverified sources, and regularly remove contacts that have been inactive or bouncing for a long time.
