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Free Email
Deliverability Tools.

Three powerful tools to diagnose, fix, and monitor your email deliverability. Used by founders, developers, and email marketers. Built by Lume.

25+
Blacklists Checked
40+
DKIM Selectors
3
Free Tools
0
Signups Required
Most Popular
🔍
Domain Health Checker
Instantly check if your domain's SPF, DKIM, and DMARC records are correctly set up. Covers 40+ email providers including Gmail, Resend, SendGrid, and Mailchimp.
SPF DKIM DMARC DNS
Check Your Domain →
🚫
Blacklist Checker
Check your domain against 25+ major DNS blacklists — Spamhaus, Barracuda, SpamCop, SORBS, SURBL, and more. Being listed silently kills email delivery.
Spamhaus Barracuda SpamCop DNSBL
Check Blacklist Status →
📋
Email Header Analyzer
Paste raw email headers and instantly see the full routing path, authentication results (SPF/DKIM/DMARC), delivery time, sender IP, and spam scores.
Routing Auth Results Spam Score Headers
Analyze Headers →
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<iframe src="https://lumesend.com/tools/domain-health-checker" width="100%" height="600" frameborder="0" style="border-radius:16px; border:1px solid rgba(34,211,238,0.15);" title="Domain Health Checker — SPF, DKIM & DMARC" loading="lazy"> </iframe> <p style="font-size:12px;color:#888;margin-top:8px;"> Free tool by <a href="https://lumesend.com" target="_blank">Lume</a> </p>

How it works: The embed loads directly from lumesend.com — always up to date. The "Powered by Lume" link below it gives us a backlink and gives your readers a link to the full tool. Win-win.

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