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Email Blacklist

Field notes from building outbound systems for B2B teams — infrastructure, research, and the numbers behind both.

What Is a Spam Trap? How Cold Email Senders Get Blacklisted — COLDICP
Email Deliverability Latest · March 18, 2026 · 6 min read

What Is a Spam Trap? How Cold Email Senders Get Blacklisted

One email to a spam trap can get your sending domain blacklisted within hours. Here is what spam traps are, the three types you need to know, and the list hygiene practices that keep…