We build the
boring infrastructure
that makes email work.
Purelist is a small, opinionated team. We started after watching too many great products land in spam folders because nobody owned the unglamorous work of keeping a list clean.
We bet the company on AI deliverability in 2024.
Decisions, not flags
We return a send/skip verdict, confidence and reason codes — so a human or an AI agent can act without guessing.
Outcomes over rules
We learn from the real delivered/bounced signals you report — not blacklists scraped from forums.
Explainable, not a black box
Deterministic scoring with reason codes and a verification method on every result. No magic numbers your auditors can't trust.
Timeline
- 2022
Founded by deliverability engineers tired of guessing which addresses were safe to send to.
- 2023
Shipped the core engine: syntax, MX and real SMTP mailbox verification — no test sends.
- 2024
Added catch-all detection, disposable/role classification and the bulk pipeline.
- 2025
Launched the decision engine: a confidence score, bounce risk and a send/skip verdict per address.
- 2026
Added the feedback loop and per-email memory — the engine now learns from real delivery outcomes.