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Relaymetry

Email-sending domain health, in one shot·relaymetry.com

Relaymetry provides free, no-signup diagnostic tools for email-sending domain health, covering MX, SPF, DKIM, DMARC, blacklist (DNSBL), and TLS posture for any domain. It also offers record generators, header and report analyzers, a deliverability test, and a phishing URL checker. Paid plans add continuous monitoring with scheduled checks, change history, and alerts, and an API is available for programmatic checks during early access.

What it's for

Checking MX records for a domainValidating SPF records and lookup-limit budgetsInspecting DKIM signing keysChecking DMARC policy, alignment, and reportingLooking up domains/IPs against DNSBL blacklistsChecking SMTP TLS posture including MTA-STS and TLS-RPTGenerating SPF, DMARC, and DKIM DNS recordsAnalyzing raw email headers for delivery path and authentication verdictsParsing DMARC aggregate (RUA) reportsParsing TLS-RPT (RFC 8460) reportsReverse DNS (PTR) lookup and forward-confirmed reverse DNS checksChecking DNS propagation across public resolversLooking up all DNS records for a domainRunning a live email deliverability test via a one-time addressChecking a URL for phishing red flags and Google Safe Browsing reputationContinuous monitoring of domain email-authentication health with alertsOnboarding validation of customer domains via APIBulk audits of client domain portfoliosEmbedding a live email-health badge in another productPolling for DNS record drift and blacklist appearances

Features 19

API access for programmatic domain checks
Continuous domain monitoring with scheduled checks, change history, and alerts
DKIM public key inspection
DKIM record generator with in-browser keypair generation
DMARC aggregate (RUA) report analyzer
DMARC policy, alignment, and reporting inspection
DMARC record generator
DNS propagation checker across public resolvers
DNSBL blacklist lookup for domains/IPs
Email header analyzer with SPF/DKIM/DMARC verdicts
Full DNS record lookup (A, AAAA, MX, TXT, NS, CNAME, CAA, SOA)
Live email deliverability test with 0-100 score
MX record lookup
Phishing URL checker with structural red-flag detection and Google Safe Browsing reputation check
Reverse DNS (PTR) lookup with forward-confirmed reverse DNS
SPF record generator
SPF record validation and lookup-count check
TLS posture check including MTA-STS and TLS-RPT
TLS-RPT report analyzer

At a glance

free tierAPI

TypeWeb app

DeploymentCloud

PlatformsWeb

Forsysadmins, IT leaders, SMB founders launching a new domain, deliverability consultants, MSP teams, developers, platforms

Integrations

Google Safe BrowsingSlackCloudflare

Resources

Docs

Pricing

Diagnostic tools are free with no account required. Continuous monitoring plans start at $29/mo; the Agency plan is custom-priced. During early access, paid plans are arranged individually with no automated checkout — customers request a plan and are set up personally, with no contract or automated billing yet.

FreeFree

1 domain, Daily check frequency, 90 days history, Weekly alerts, Email channel

1 domain, daily check frequency, 90 days history, weekly alerts

Starter$29/mo

Recommended plan on pricing page. Arranged individually during early access; no automated checkout.

5 domains, checks every 6 hrs, unlimited history, instant alerts

Pro$59/mo

Arranged individually during early access; no automated checkout.

15 domains, hourly checks, unlimited history, instant alerts

Business$129/mo

Arranged individually during early access; no automated checkout.

30 domains, checks every 15 min, unlimited history, instant alerts

AgencyQuote

Custom/quote-based pricing; contact required.

Custom number of domains, custom check frequency, unlimited history, instant alerts