MailSec

Free email security audit API — one curl checks SPF, DKIM, DMARC, DNSSEC, MX, and blacklists for any domain

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A free API for email security audits, MailSec runs a single query to produce an instant report on authentication records, DNS and mail-exchange settings, blacklist status, and an overall deliverability verdict. It simplifies fragmented, multi-tool checks for system administrators, deliverability engineers, and developers integrating email-security checks. A free tier is included.

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Full match profile

Behind the summary, Matchbox keeps a richer profile of MailSec - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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