Free tools
Email deliverability tools, free forever.
No signup, no email capture, no rate limits worth noticing. Made for developers and deliverability-curious site owners.
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Email deliverability test
One-shot health check: SPF, DKIM, DMARC, MX, and reverse-DNS for any domain.
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SPF record checker
Look up your SPF record, expand its include chain, and warn on the 10-lookup limit.
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DKIM validator
Fetch and validate the DKIM public key for any selector. Confirms it parses and is usable.
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DMARC record generator
Build a safe DMARC record for your domain: pick a policy, add report addresses, get the TXT to publish.