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mxio.io

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mxio is an email authentication management platform covering SPF, DKIM and DMARC. It monitors a domain's MX, SPF, DKIM and DMARC records against authoritative DNS and alerts when a record changes. It ingests DMARC aggregate reports and classifies every service sending mail as the domain, showing SPF and DKIM alignment for each. It measures SPF lookup-budget usage against the RFC 7208 ten-lookup limit, and monitors MTA-STS, DNSSEC, domain expiry, MX SMTP reachability and DNS blacklist listings. On its higher tiers mxio also publishes and maintains the SPF and DMARC records themselves through selective record delegation: the customer points a named record at mxio and retains control of their own DNS zone. It provides guidance for advancing a DMARC policy from none to quarantine to reject based on observed sender alignment. 23 diagnostic tools — SPF, DKIM, DMARC, MX, blacklist and header checks — are available without an account.

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