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fast-classifier

The Newsletter Sweep

Lives in src/pipeline/sweep.ts.

What

Section titled “What”

Full-text unsubscribe heuristic in, keep-list out, label + archive. The keep-list is enforced twice: as a server-side notFrom filter and re-checked client-side against every result.

Origin

Section titled “Origin”

3,849 newsletters swept in one run, zero keepers lost.

Quirk it encodes

Section titled “Quirk it encodes”

Fastmail’s -from: search operator takes literal addresses only — domain negation is silently ignored — so the client-side re-check is mandatory, not defensive. An empty keep-list logs a warning.