// TOOLS
Free deliverability tools — no signup, no limits
The same checks CLAYINBOX runs continuously on every managed domain, available standalone. Use them once, or pipe them through the API.
SPF Checker
Validate SPF records, lookups, and mechanisms.
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DKIM Checker
Verify DKIM key presence, length, and selector.
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DMARC Checker
Parse DMARC policy, alignment, and reports.
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MX Lookup
Find MX hosts, priorities, and provider.
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Blacklist Checker
Check 50+ RBLs for your domain or IP.
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Email Verifier
Syntax, MX, SMTP, catch-all, and disposable checks.
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