Spam traps

A spam trap is a type of email address used by inbox providers, blocklist operators, or anti-abuse organizations to identify bad sending practices. These addresses aren’t owned by real users and should never receive legitimate email, so if a sender hits one, it’s a clear sign of poor list hygiene or non-consensual acquisition. 

There are generally understood to be two main types: 

• Pristine traps: Created solely to catch spammers. These addresses have never opted in anywhere and often hide on websites or forums to lure scrapers. 
• Recycled traps: Previously valid addresses that were abandoned, then reactivated by inbox providers as traps after a period of inactivity. 

Why it matters: 

Hitting a spam trap damages sender reputation and may trigger: 

• Filtering to spam folders 
• Placement on blocklists (like Spamhaus) 
• Reduced deliverability across all recipients 

How to avoid spam traps: 

• Never buy, rent, or scrape email lists 
• Use confirmed (double) opt-in to ensure real consent 
• Regularly remove unengaged or bounced email addresses 
• Use engagement-based pruning to maintain list quality 

Spam traps don’t file complaints or bounce – they’re quiet but deadly. One hit won’t kill you, but repeated hits can wreck your deliverability.