In private beta
Send your email here.
We grade what Gmail would do to it.
Most deliverability checkers refuse your message if it looks spammy — so you never see what would happen next. Send to Email Health Pro and we grade what Gmail would have done, even when SPF, DKIM, or content would have failed.
Six categories. Almost all the signal.
Gmail, Yahoo, and Microsoft weigh dozens of deliverability signals before deciding whether your email reaches the inbox, the promotions tab, or the spam folder. We grade the six categories that account for most of it.
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SPF
Sender Policy Framework — proves your servers are allowed to send for your domain.
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DKIM
Cryptographic signature mailbox providers use to verify the message wasn’t tampered with.
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DMARC
Policy that ties SPF and DKIM together and tells receivers what to do on failure.
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TLS
STARTTLS support, cipher strength, and certificate validity for in-transit encryption.
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rDNS / FCrDNS
Reverse DNS that confirms your sending IP matches your HELO name.
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Content
SpamAssassin scoring, link reputation, header alignment, MIME structure, attachments.
How a test works
Three steps from "send" to "here's why mailbox providers are filtering you."
Send a test message
Send your real message — newsletter, transactional, or cold outreach — to a unique test address.
We grade everything
Authentication, TLS, rDNS, content, headers, attachments — graded on the way in and recorded.
Read your report
Look up your report by sender address and the token in our reply. No account needed.
Popular guides
Plain-language explainers of every signal that decides whether your email reaches the inbox.
Email Health Pro is in private beta.
We’re letting senders in as we tune the grading rules. Get on the list and you’ll be among the first.
Email me when the beta opens