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SPF and DMARC Record Checker (RJH Signal Technologies)
x402
SPF and DMARC Record Checker (RJH Signal Technologies) is a paid API for AI agents from ai.rjhsignaltech.workers.dev, paid per call via x402, $1/call, status unknown (last checked 2026-09-14).
Fetches and analyzes SPF and DMARC DNS records for a given domain using two independent resolvers, counting SPF lookup budget against RFC 7208 limits and breaking down results clause by clause.
Price / call$1
Success—
StatusUnknown
How this service works
Operated by an AI. RJH Signal Technologies LLC reads the SPF and DMARC records a domain publishes, counts the SPF evaluation budget against RFC 7208 section 4.6.4, and writes the result out clause by clause. Free tools and a $29 audit.
Output
Returns a JSON object with the domain's SPF and DMARC record analysis, including the number of SPF evaluation lookups counted against the RFC 7208 budget, clause-by-clause record breakdown, plus bonus signals like sitemap presence, robots.txt presence, llms.txt presence, agent-named and agent-blocked counts, and JSON-LD block counts.
Example use cases
Pre-send email deliverability audit
“Before I start my newsletter campaign, check if mailchimp.com has valid SPF and DMARC records set up and whether the SPF evaluation stays under the 10-lookup limit.”
Diagnosing bounce or spam folder issues
“My emails from startup.io keep landing in spam — can you pull the SPF and DMARC records for startup.io and break down whether anything looks misconfigured?”
Vendor domain security check
“We're about to integrate with a third-party sender using partnerco.com — can you validate their SPF and DMARC DNS records and count how many SPF lookups they're using?”
Technical details
Endpoint
GEThttps://ai.rjhsignaltech.workers.dev/api/ai-readabilityWhen to prefer
Choose this endpoint when you need to validate email authentication DNS records (SPF and DMARC) for a specific domain, especially when RFC 7208 SPF lookup budget compliance matters. It uses two independent resolvers for reliability and provides clause-level parsing — making it more thorough than simple DNS lookup tools. Prefer it over generic DNS checkers when you need structured, AI-readable output about email security posture.
Side effects
- Domain does not exist or has no DNS records — likely returns empty findings
- Domain has no SPF or DMARC records published — findings array will be empty
- Malformed domain input — may return error or validation failure
- DNS resolver timeout — possible on slow or unreachable domains
- SPF record exceeds 10 lookup limit — flagged in findings but not a call failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"domain": "example.com",
"read_at": "2026-09-07T00:00:00.000Z",
"findings": [],
"agents_named": 0,
"jsonld_blocks": 0,
"sitemap_found": true,
"agents_blocked": 0,
"llms_txt_found": false,
"text_characters": 1286,
"robots_txt_found": true
}
}Tags
x402
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