Email list quality score

Score your list quality from verification results and see how it will affect your deliverability before you send.

Free · No signup · Runs in your browser

List quality / inputresultsfig.

Total emails

ValidInvalid

Catch-all

List quality / resultscorefig.

90.0%

Quality score

Valid = 100% · Catch-all = 50% · Invalid = 0%

Good

Catch-all addresses count half — they're a coin flip.

Tier	Quality	What to do
Excellent	95%+	Send confidently — list is clean.
Good← YOU	85–95%	Solid; remove the invalids first.
Fair	70–85%	Re-verify before any big send.
Poor	< 70%	Don't send — clean the list.

List quality

Score before you send

Valid = full credit

Confirmed deliverable addresses score 100%. The more valids, the safer your send.

Catch-all = half

Catch-all domains accept everything, so they're a coin flip — they count for 50% in the score.

Invalid = zero

Invalids bounce and damage reputation. Remove them entirely before any campaign.

FAQ4 entries

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Quality score = ((valid × 1.0 + catch-all × 0.5) ÷ total) × 100. Valids count fully, catch-alls half, invalids zero.

95%+ is excellent and safe. 85–95% is good once you strip invalids. Below 70%, clean and re-verify before sending.

A catch-all domain accepts mail to any address, so verification can't confirm a specific inbox exists — treat these as risky.

Verification cuts bounces, protects sender reputation, and keeps your inbox placement high — it's the cheapest deliverability win there is.

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