Which type of spam trap is the most damaging?

There are three main types of spam traps: pristine traps, recycled traps, and typo traps. They're all bad. But pristine traps are in a different category of bad.

Pristine traps (honeypots) are email addresses that were never real. They were created specifically to catch senders who scrape addresses, harvest lists, or buy contact data. No human ever signed up with one. If you're hitting pristine traps, there's no innocent explanation. Mailbox providers and blocklist operators know that and treat it accordingly. Hitting one can get your domain or IP blocklisted immediately, often without warning.

Recycled traps are addresses that used to belong to real people. After years of inactivity, the provider repurposed them as traps. Hitting these usually means your list is old or your re-engagement hygiene is poor. It's still damaging, but it's a signal of age and neglect rather than bad acquisition. Recovery is slower but possible.

Typo traps (like gnail.com instead of gmail.com) are registered by reputation organizations watching for sloppy list practices. They catch senders who skip email validation at signup. They're the least severe of the three, but they still flag you as careless.

The reason pristine traps are uniquely destructive is the signal they send. Recycled and typo traps suggest poor hygiene. A pristine trap hit tells blocklist operators you're acquiring addresses in ways that can't possibly be opt-in. That's a much harder reputation hole to climb out of.

If you're worried your list might contain trap-like addresses, prevention is the only real answer. You can't spot them by looking at the addresses. What you can do is keep your list clean, validate at signup, and stop sending to addresses that have never engaged. If you want someone to audit the list before your next big send, we clean them (hi ;)) at Review My Emails.