What is a spamtrap (brief intro)?
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You're sending to a clean list, following best practices, and suddenly your deliverability tanks. What happened? One likely culprit: you hit a spamtrap.
A spamtrap is an email address that exists only to catch senders with bad list hygiene. It's not owned by a real person, it never signs up for anything, and it never opts in. If you're sending to one, it means you scraped the address, bought a list, or kept emailing people who abandoned their inboxes years ago.
There are two main types of spamtraps. Pristine spamtraps are addresses created specifically to catch spammers. They're published on public websites or buried in email harvesting honeypots, but they're never used as real inboxes. If you hit one, you scraped or bought that list. Recycled spamtraps are abandoned email addresses that mailbox providers converted into traps after years of inactivity. Think of the old AOL account someone stopped checking in 2008. If you're still emailing it in 2025, that's a red flag for poor list maintenance.
Hitting a spamtrap doesn't just hurt your reputation with one inbox provider. Organizations like Spamhaus and SpamCop maintain spamtraps across thousands of domains. Hit enough of them and your sending domain or IP lands on a blocklist, which means your emails stop reaching inboxes entirely (not just spam folders, but nowhere). So The fix: clean your list regularly, remove unengaged subscribers, and never buy email lists. If you're migrating an old list or inheriting contacts from a merger, run them through validation first. You can check for obvious issues with our free blocklist checker, or clean your entire list with Review My Emails if you're not sure what's lurking in there.
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