Spam trap detection
Keep spam traps off your email list
One spam trap hit can put your domain on a blocklist. Truelist flags known traps and the dead addresses that turn into traps. You choose which addresses to keep when you download the list.
What is a spam trap?
A spam trap is an email address that mailbox providers and blocklist operators use to catch senders with poor list practices. No person reads it, so mail that reaches it shows the sender either collected addresses without permission or kept mailing old addresses long after they went quiet. There are three main kinds:
- Pristine traps
- Addresses created only to catch spam, never used by a person. They’re hidden on web pages for scrapers, seeded into bought lists, or submitted by bots to unprotected forms. Hitting one points to scraped or purchased data, and they’re the most damaging kind.
- Recycled traps
- Old addresses that were abandoned, bounced for months, then turned back on by the mailbox provider to catch senders who never clean their lists.
- Typo traps
- Addresses on misspelled domains like gmial.com or yaho.com. They catch senders who don’t confirm sign-ups.
More detail in our guide to spam trap checkers.
How Truelist helps
Four layers between your list and a spam trap
No verifier can see every trap: they’re secret by design. What verification can do is flag the addresses traps hide among, so you can leave them out of a send.
Known spam traps are flagged
Addresses Truelist identifies as spam traps come back invalid with the sub-status “failed spam trap,” so you can take them out of what you send. The full CSV still includes every address; a safest-bet download keeps only addresses whose state is ok and whose sub-status is email_ok.
Dead mailboxes are flagged
Recycled traps start life as abandoned addresses. Mailboxes that don’t exist come back invalid. A safest-bet download, or a suppression you turn on, leaves them off the list you send before a provider turns them into traps.
Risky addresses are labeled
Disposable, role and catch-all addresses each get their own sub-status, so you can decide how to treat them instead of mailing them blind.
Lists are re-checked over time
Addresses go bad every month. Recurring validation re-checks your lists on a schedule and flags new problems, including mailboxes that have gone dead. You choose whether those are suppressed in your email tool or tagged for review, which shortens how long a dead mailbox sits on the list.
Habits that keep traps away
Verification catches what’s already on your list. These habits stop traps getting there in the first place.
- Never buy, rent or scrape lists. That’s where pristine traps come from.
- Catch typos on sign-up forms with real-time validation, and confirm sign-ups with double opt-in so bots can’t add traps.
- Stop mailing people who haven’t engaged in about six months. Abandoned mailboxes can be recycled into traps.
- Suppress an address on its first hard bounce. Retry rules are for soft bounces only.
- Verify new and imported lists before the first send, and older lists again every few months.
Related
- Email list analysis Free: upload a list and see valid, risky, catch-all and invalid counts.
- Domain DNS check Free: look up MX, SPF and DMARC. The score is a DNS heuristic, not how mailbox providers rate the domain, and the blocklist rows are simulated.
- Recurring validation Re-verify your lists on a schedule.
- Verification result codes Every status and sub-status Truelist returns.
Frequently asked questions
Can't find the answer you're looking for? Reach out to our customer support team.
- What is a spam trap?
- A spam trap is an email address that mailbox providers and blocklist operators use to catch senders with poor list practices. Pristine traps are created only to catch scraped or bought addresses; recycled traps are abandoned mailboxes turned back on to catch senders with stale lists. Either way, mail that reaches one counts against the sender.
- How does Truelist detect spam traps?
- Truelist flags addresses it identifies as spam traps as invalid, with the sub-status “failed spam trap.” It also flags addresses whose mailboxes no longer exist, which is how recycled traps start, and labels disposable, role and catch-all addresses so you can treat them separately. Downloads let you choose which rows to keep: the full file includes every address, and the safest-bet file keeps only addresses with state ok and sub-status email_ok.
- Can any tool find every spam trap?
- No. Trap operators keep their addresses secret, and a pristine trap looks like any other working mailbox. Any verifier that claims to find all spam traps is overclaiming. Verification lowers the risk. Confirmed consent, which blocks pristine traps, plus regularly removing inactive subscribers, which avoids recycled ones, is what keeps traps off your list.
- What happens if I hit a spam trap?
- Depending on the trap’s owner, your sending IP or domain can be added to a blocklist, your sender reputation drops, and more of your mail lands in spam or gets rejected. A single pristine trap hit can be enough to get listed.
- How do I know if I’ve hit a spam trap?
- You usually won’t be told directly. Signs include a sudden drop in inbox placement, a listing on a blocklist such as Spamhaus, or a warning from your email service. Look up your domain and sending IPs on the blocklist operator’s own site. Spamhaus, for example, publishes a lookup.
- How do I remove spam traps from my list?
- Verify the list and drop invalid addresses, including those flagged as spam traps. Then remove subscribers who haven’t engaged in about six months. Don’t treat a lone open or click as proof of a real person: security filters open and scan mail automatically. If you were blocklisted, follow the blocklist’s removal process after cleaning the list.
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