Definition
A spam trap is an email address run by a mailbox provider or blocklist operator to identify senders who mail people who never asked to hear from them. Trap addresses never sign up for anything, so any mail they receive is evidence of a list problem.
There are three broad types:
- Pristine traps were never used by a real person. They are published where scrapers find them, or simply never shared. Hitting one suggests scraped or bought data.
- Recycled traps were once real addresses. After a long period of inactivity, and after bouncing for a while, the provider reactivates them as traps. Hitting one suggests you are mailing very old data without hygiene.
- Typo traps sit at misspelled domains, such as a common misspelling of a big webmail domain. They catch senders who accept addresses without checking them.
Why it matters
Trap hits can damage your sender reputation or get your domain or IP listed on a blocklist, sometimes with no bounce or other visible warning. Because operators keep trap addresses secret, you will rarely know which address caused the problem.
How SimpleCold handles it
Be wary of any tool that claims to detect every spam trap. Pristine traps are built to look like ordinary valid addresses, and no verifier can reliably identify them. Avoiding them comes down to where your data comes from: do not buy lists, and do not scrape addresses you have no reason to contact.
Verification does reduce the other two types. Recycled traps often sit behind addresses that bounced for months, and verifying old lists before sending removes many of those dead mailboxes. SimpleCold also checks for misspelled domains and returns a suggestion with the likely correct address, which helps keep typo-trap addresses out of your list at the form.
Clean an older list with the bulk email verifier before you send to it.