Stop guessing why your emails hit spam.

EmailTesterLite gives you clean, instant answers for DKIM, SPF, DMARC, and headers. No dashboards. No upsells. Just clarity.

Run a Free Test View Tools

DKIM Checker

Validate DKIM signatures and alignment.

SPF Checker

Check SPF records for your domain.

Email Header Analyzer

Human-readable relay paths & auth results.

List Cleaner

Identify risky, disposable, and role-based addresses.

Script Enhancer

Improve and optimize your scripts efficiently.

How it works — 3 quick steps

1. Paste a header or domain

Provide an email header or a sending domain. We don’t require signup — testing starts immediately.

2. Get clear results

Readable verdicts (Pass / Fail) with actionable fixes — no cryptic dumps.

3. Fix and re-check

Tweaks are fast. Re-run checks until the green light — iteratively and privately.

Real results, zero fluff

Teams use EmailTesterLite to reduce bounces, improve inbox placement, and cut troubleshooting time. The product is intentionally small — we focus on the checks that actually move the needle.

40%
Avg bounce reduction
99.9%
Tool uptime
1,000+
Checks performed
"Found a misaligned DKIM that our ESP never flagged — campaign recovered."
— Neha, Email Ops
"Header analysis saved us hours. Simple, fast, and accurate."
— Carlos, Dev
Sample result
DKIM: PASS (selector=mail)
SPF: PASS (include:mail.example.com)
DMARC: FAIL (policy=none; pct=100)
Action: Add DMARC reporting + correct policy to quarantine/reject when ready.

FAQ

Do you store headers or email content?
By default we do not persist headers. You can optionally upload data for diagnostic history, but nothing is shared publicly.
Is this free to use?
Yes — the core checks are free. We offer paid access for higher-volume CSV list cleaning and API access (contact us if needed).
How is this different from other email tools?
Most email tools dump raw data and expect you to interpret it. EmailTesterLite gives clear verdicts, real explanations, and fixes you can apply immediately.

Ready to fix your deliverability?

Run a free test — get instant, actionable results and re-check as you fix issues.
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