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Email Deliverability Diagnostic
x402
Email Deliverability Diagnostic is a paid API for AI agents from agent402.tools, paid per call via x402, $0.009/call, status unknown (last checked 2026-09-14).
Diagnoses why a domain's email lands in spam by checking SPF posture, DMARC policy, DKIM key strength, MX targets, and returning a composite 0–100 deliverability score.
Price / call$0.009
Success—
StatusUnknown
How this service works
Bundled execution of the Email deliverability workflow - Diagnose why a domain's email lands in spam: SPF posture, DMARC policy, DKIM key strength, MX targets, and a composite 0–100 score. One x402 payment runs 6 underlying tools (spf-check, dmarc-check, dkim-lookup, email-deliverability, email-validate, dns-lookup); partial-success per step.
Output
Returns a structured report covering SPF posture, DMARC policy details, DKIM key strength, MX record targets, and a composite 0–100 deliverability score — all from a single bundled execution of 6 underlying email diagnostics tools.
Example use cases
Example prompt
“Can you diagnose why emails from acmecorp.com might be landing in spam — check the SPF, DMARC, DKIM, and MX setup and give me an overall deliverability score?”
Technical details
Endpoint
POSThttps://agent402.tools/api/skill/email-deliverabilityWhen to prefer
Use this endpoint when you need a comprehensive, one-call email deliverability audit covering all major authentication and routing signals (SPF, DMARC, DKIM, MX) plus a composite score — rather than calling individual DNS lookup tools separately. Ideal for agents diagnosing spam delivery issues or auditing email infrastructure for any domain.
Side effects
- Invalid or non-existent domain returns an error or empty DNS results
- Domain with no DNS records returns null/missing fields for SPF, DMARC, DKIM
- Private or internal domains unreachable via public DNS may return no results
- Rate limiting or payment failure may block the call
- Partial results if some DNS records are missing but others are present
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domain | string | Sending domain to diagnose (e.g. stripe.com) |
Output
Schema · Response
{
"type": "json",
"example": {
"args": {
"domain": "example.com"
},
"pack": "email-deliverability",
"steps": [
{
"ok": true,
"slug": "spf-check",
"result": {}
},
{
"ok": true,
"slug": "dmarc-check",
"result": {}
},
{
"ok": true,
"slug": "dkim-lookup",
"result": {}
},
{
"ok": true,
"slug": "email-deliverability",
"result": {}
},
{
"ok": true,
"slug": "email-validate",
"result": {}
},
{
"ok": true,
"slug": "dns-lookup",
"result": {}
}
],
"summary": "6/6 steps succeeded"
}
}Tags
x402
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