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agent402.tools Email Deliverability Analyzer
x402
agent402.tools Email Deliverability Analyzer is a paid API for AI agents from agent402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-10).
Runs a comprehensive email authentication audit for a domain — SPF, DMARC, DKIM (auto-probing 14 common selectors), and MX records — returning a 0–100 deliverability score.
Price / call$0.002
Success—
StatusUnknown
How this service works
End-to-end email-auth report for a domain: SPF + DMARC + DKIM (probes common selectors automatically) + MX records + score 0–100. The one call to make when 'why is our mail going to spam?' lands in your inbox.
Output
Returns a structured report containing the domain's SPF record status, DMARC policy details, DKIM probe results across up to 14 common selectors, MX record information, and a composite deliverability score from 0 to 100 indicating overall email authentication health.
Example use cases
Example prompt
“Our emails from acmecorp.com keep landing in spam — can you run a full email deliverability audit on acmecorp.com, including SPF, DMARC, DKIM, and MX records, and give me the deliverability score?”
Technical details
Endpoint
POSThttps://agent402.tools/api/email-deliverability?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a single-call, all-in-one email authentication report covering SPF, DMARC, DKIM, and MX — especially when diagnosing spam delivery issues. Prefer this over manual DNS lookup tools when you want an automated score and don't want to check each record type separately.
Side effects
- Domain does not exist or has no DNS records — returns empty results or error
- Invalid domain/email format — validation error returned
- DNS lookup timeout for slow or unresponsive nameservers
- No DKIM selectors found if domain uses non-standard selectors not in the default list — caller should supply custom selectors via dkimSelectors parameter
- Payment not included or invalid x402 payment — 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domain | string | Domain name (also accepts email/url/host) |
| dkimSelectors | array | Optional DKIM selectors to probe (overrides default list of 14 common selectors) |
Output
Schema · Response
{
"type": "json",
"example": {
"mx": {
"count": 5,
"records": [
"smtp.google.com"
]
},
"spf": {
"all": "softfail",
"valid": true,
"hasRecord": true,
"lookupCount": 1
},
"dkim": {
"found": [
{
"bits": 2048,
"valid": true,
"selector": "20221208"
}
],
"probed": [
"google",
"selector1",
"default",
"20221208"
]
},
"dmarc": {
"valid": true,
"policy": "reject",
"percent": 100,
"hasRecord": true
},
"score": 90,
"checks": [
{
"check": "spf",
"detail": "SPF record present, 1 DNS lookup, ~all qualifier",
"status": "pass"
},
{
"check": "dmarc",
"detail": "p=reject at 100% - strict enforcement",
"status": "pass"
},
{
"check": "dkim",
"detail": "Found DKIM at selector 20221208 (2048-bit RSA)",
"status": "pass"
},
{
"check": "mx",
"detail": "5 MX records configured",
"status": "pass"
}
],
"domain": "google.com",
"summary": "good",
"queriedAt": "2026-06-19T20:00:00.000Z"
}
}Tags
x402
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