Definition
Spam trap: An address controlled by a mailbox provider or blocklist operator to identify senders with poor list practices. It never signs up for anything, so mail it receives shows a list was bought, scraped, mistyped or never cleaned. The main types are pristine, recycled and typo traps.
Types of spam traps: pristine, recycled and typo
Pristine traps were never used by a person. They are published where harvesters scrape addresses, so only scraped or bought lists reach them.
Recycled traps are abandoned addresses that a provider reactivates as a trap after they have bounced for a long period. Typo traps sit on misspellings of popular domains, such as gmial.com, and catch addresses typed wrong at signup that nobody confirmed.
How senders hit spam traps
Bought, rented and scraped lists are the fastest route to pristine traps. Old segments mailed after a long gap are the route to recycled ones.
Signup forms without confirmation let typos and bots in, and co-registration deals add addresses whose owners never heard of you.
How to avoid spam traps
Build the list on permission: double opt-in for signups, no purchased data. Verify addresses at the form and before any send to an old segment.
Suppress hard bounces at once and for good, so an address that dies never gets mailed long enough to become a recycled trap. Retire subscribers who have not engaged in a long time.
How RocketVerifier handles it
Our spam trap detection is rule-based: known typo-trap domains such as gmial.com and trap-style local parts such as spamtrap@ or honeypot@ come back as risky with sub_status possible_trap. Pristine and recycled traps look like ordinary mailboxes by design, so the defense against them is your list source: permission-based signups, verification at capture and immediate suppression of hard bounces. RocketShield blocks mistyped and undeliverable addresses on your forms before they ever reach your list.