Free Email List Health Grader: Get an Instant A–F Quality Score for Your List

The quality of your email list directly determines your deliverability, open rates, and sender reputation. A list full of invalid, duplicate, or temporary addresses will tank your campaigns before a single send.

Paste up to 500 email addresses and our health grader will instantly analyze syntax, duplicates, free vs business domains, disposable emails, and more — giving you an actionable quality grade.

Email List Health Grader

Paste your email list below (one email per line, or comma/space separated). Up to 500 emails.

All analysis is done in your browser. Your list is never uploaded.

Score: {{ report.score }}/100

Total Emails

Valid Syntax

Invalid Syntax

Duplicates

Free Email Domains

Temp/Disposable

Issues Found

No major issues found. Your list looks healthy!

List Composition

{{ bar.label }} {{ bar.count }} ({{ bar.pct }}%)

Top Domains

{{ d.domain }}{{ d.count }} email(s)

Recommendations

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Run a full deliverability check (MX validation, SMTP verification, catch-all detection) on your complete list.

Start Bulk Verification – 100 Free Credits/Day

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What We Check

What Does the Email List Health Grader Analyze?

Syntax Validation

Every email is checked against RFC 5322 syntax rules to identify malformed addresses like missing @, invalid TLDs, or illegal characters.

Duplicate Detection

Duplicate emails inflate list size and waste sending credits. We identify all exact duplicates and case-insensitive near-duplicates.

Disposable Email Detection

Temp and burner email addresses (Mailinator, Guerrilla Mail, etc.) are flagged to help you identify low-quality signups.

Free vs Business Domains

Lists heavy in free email providers (Gmail, Yahoo, Outlook) often have lower engagement rates vs business email addresses.

Domain Diversity

We analyze domain concentration to identify deliverability risk from over-reliance on a small number of domains.

Overall Health Score

All metrics are combined into an A–F grade with actionable recommendations for improving your list quality.

FAQ

Frequently Asked Questions

Is my email list safe? Will it be uploaded or stored?

Your email list is completely safe. All analysis is performed entirely in your browser using JavaScript. No data is sent to our servers at any point. Close or refresh the page and the list is gone.

What's a good health score?

An A grade (90–100) indicates an excellent list with minimal issues. B (80–89) is good. C (70–79) is acceptable but has room for improvement. D (60–69) indicates significant issues to address. F (below 60) means the list needs urgent cleaning before sending.

This only checks syntax — can I get full verification?

Yes. This tool performs a client-side analysis. For full deliverability verification (MX validation, SMTP connection test, catch-all domain detection), create a free MyEmailVerifier account and use our bulk verification tool. You get 100 free credits per day.