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DMARC + SPF + DKIM Email Authentication Checker
x402
DMARC + SPF + DKIM Email Authentication Checker is a paid API for AI agents from x402-deployer.x402-deployer.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Audits a domain's email authentication posture by reading its DNS TXT records for SPF, DMARC, and DKIM, then returns a 0-100 score, A-F grade, and human-readable findings explaining spoofing resistance and deliverability readiness.
Price / call$0.02
Success—
StatusUnknown
How this service works
DMARC + SPF + DKIM email-authentication checker / mail-auth posture audit / spoofing-resistance grader / phishing-readiness scanner / domain email security score / dmarcian-style report / pre-send deliverability check. Reads the domain's DNS TXT records, parses each protocol's record (SPF mechanisms + qualifiers, DMARC tags p/sp/rua/ruf/pct/aspf/adkim, DKIM selectors with key bits and algorithm), and returns a 0-100 score, A-F grade, and per-finding human-readable reasons explaining the score.
Output
Returns a 0-100 numeric score, an A-F letter grade, parsed SPF mechanisms and qualifiers, all DMARC tag values (p, sp, rua, ruf, pct, aspf, adkim), DKIM selector details including key size in bits and algorithm, plus a list of human-readable findings explaining exactly what is configured correctly or incorrectly and why points were deducted.
Example use cases
Example prompt
“Can you do a full DMARC, SPF, and DKIM audit on acme.com and tell me the overall score, grade, and any issues with my email authentication setup that could let spoofed emails through?”
Technical details
Endpoint
POSThttps://x402-deployer.x402-deployer.workers.dev/dmarc-checkWhen to prefer
Use this endpoint when you need a structured, scored audit of a domain's complete email authentication posture (SPF + DMARC + DKIM together) with per-finding explanations and a normalized grade — rather than a raw DNS lookup tool that just returns record text without parsing or scoring.
Side effects
- Domain has no SPF or DMARC record — returned with zero score and findings noting missing records
- Invalid or malformed SPF/DMARC syntax — parser returns error details for the offending record
- Domain does not exist or DNS lookup fails — returns DNS resolution error
- DKIM selectors not discoverable — DKIM portion of report may be incomplete or skipped
- Rate limiting or upstream DNS timeouts — request may fail with a 429 or 5xx response
Input
{
"domain": "example.com"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"spf": {
"record": "v=spf1 -all",
"version": "v=spf1",
"mechanisms": [
"v=spf1",
"-all"
],
"has_includes": false,
"has_redirect": false,
"all_qualifier": "-all"
},
"dkim": {
"selectors_found": [
{
"record": "v=DKIM1; p=",
"selector": "default"
},
{
"record": "v=DKIM1; p=",
"selector": "google"
},
{
"record": "v=DKIM1; p=",
"selector": "k1"
},
{
"record": "v=DKIM1; p=",
"selector": "k2"
},
{
"record": "v=DKIM1; p=",
"selector": "selector1"
},
{
"record": "v=DKIM1; p=",
"selector": "selector2"
},
{
"record": "v=DKIM1; p=",
"selector": "s1"
},
{
"record": "v=DKIM1; p=",
"selector": "s2"
},
{
"record": "v=DKIM1; p=",
"selector": "mail"
},
{
"record": "v=DKIM1; p=",
"selector": "mta"
},
{
"record": "v=DKIM1; p=",
"selector": "smtp"
},
{
"record": "v=DKIM1; p=",
"selector": "key1"
},
{
"record": "v=DKIM1; p=",
"selector": "key2"
},
{
"record": "v=DKIM1; p=",
"selector": "fm1"
},
{
"record": "v=DKIM1; p=",
"selector": "fm2"
}
],
"selectors_checked": [
"default",
"google",
"k1",
"k2",
"selector1",
"selector2",
"s1",
"s2",
"mail",
"mta",
"smtp",
"key1",
"key2",
"fm1",
"fm2"
]
},
"dmarc": {
"pct": 100,
"rua": null,
"ruf": null,
"aspf": "s",
"adkim": "s",
"policy": "reject",
"record": "v=DMARC1;p=reject;sp=reject;adkim=s;aspf=s",
"version": "DMARC1",
"subdomain_policy": "reject"
},
"grade": "A",
"score": 100,
"domain": "example.com",
"source": "Cloudflare DNS-over-HTTPS (1.1.1.1)",
"reasons": [
"SPF -all hard fail (strict)",
"DMARC p=reject (strict)",
"DKIM record found (15 selectors)"
]
}Tags
x402
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