The three kinds
- Pristine traps: addresses that were never used by a person and are hidden on websites or in data. Only scraped or bought lists reach them.
- Recycled traps: old addresses that bounced for a long time, then were turned back on as traps. They catch lists that were never cleaned.
- Typo traps: addresses at misspelt domains such as gmial.com, which catch lists with no checks on entry.
Traps are not published, and a verifier cannot reliably spot them because many are real, working mailboxes. That is what makes them useful to the people who run them: hitting one says something about how a list was built, not about one bad address.
A team buys a list of 5,000 contacts. A few are pristine traps. Within days the sending domain appears on a blocklist, and replies stop at providers that use it.
What a hit does
Depending on who runs the trap, a hit lowers your sender reputation at that provider or gets your domain or IP listed on a public blocklist, which other providers consult. Getting delisted usually means fixing the cause first and then asking the list operator for removal.
How to avoid them
Never buy or scrape lists, verify every address, remove addresses that hard bounce, re-verify lists older than a few months, and stop sending to people who never engage. Keep cold email on separate domains so a mistake does not reach your main one.
ZicReach checks every sending domain against blocklists and shows Clean, Listed or Unavailable for each list, with a removal request, on the warmup and deliverability page. Leads found in the AI Leads Engine are verified before they reach a campaign.