# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from x402-audit.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-21).

Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX, SPF, and DMARC record checks.

## Facts

- Endpoint: GET https://x402-audit.agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: x402-audit.agentdiet.dev
- Website: https://x402-audit.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/x402-audit-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-bfb32f5a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Gb9T8HJVpY2rl8wczB2H-

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-audit-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-bfb32f5a
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email — specifically whether it has valid MX records, passes SPF and DMARC, and isn't from a disposable or burner provider?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email verification that goes beyond simple syntax checking — specifically when you need live DNS MX, SPF, and DMARC record lookups combined with disposable provider and role account detection in a single call. Prefer it over basic regex validators when building lead enrichment pipelines, fraud prevention workflows, or pre-send email campaign quality gates.

## Known failure modes

- Missing or malformed email parameter returns a validation error
- Non-existent domain with no DNS records may return MX lookup failure
- Temporary DNS timeouts may cause inconclusive MX/SPF/DMARC results
- Very new domains may not yet have propagated DNS records, yielding false negatives
- Payment not settled via x402 returns HTTP 402 before any result is provided

## How this service works

Validates email syntax, disposable/burner provider status, role accounts, and live DNS MX/SPF/DMARC records. (Live x402 v2, IETF MPP & MCP endpoint at https://x402-audit.agentdiet.dev/v1/mx-deliverability-verifier)

## Output

Returns a structured object containing: email syntax validity, whether the domain uses a known disposable/burner email provider, whether the address is a role account (e.g. info@, support@), live DNS MX record presence and details, SPF record presence and content, and DMARC record presence and policy — giving a comprehensive deliverability and legitimacy verdict.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "email"
 ],
 "properties": {
  "email": {
   "type": "string",
   "minLength": 1,
   "description": "Email address to validate for syntax, MX deliverability, and disposable risk"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-audit-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-bfb32f5a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-audit.agentdiet.dev](https://www.zero.xyz/host/x402-audit.agentdiet.dev/llms.txt)