# 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 presence.

## Facts

- Endpoint: GET https://x402-audit.agentdiet.dev/v1/spf-dmarc-auditor?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-5ad0f091
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_k0hhlBADDPNbaRBMeP0CV

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-5ad0f091
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — including whether the domain has MX, SPF, and DMARC records set up and whether it's from a disposable provider?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email deliverability check that combines syntax validation, DNS MX record lookup, SPF/DMARC authentication record auditing, and disposable provider detection in a single call — particularly useful for lead enrichment pipelines, signup fraud prevention, or cold outreach preparation where email quality directly affects deliverability and domain reputation.

## Known failure modes

- Email address missing or malformed input returns a 400-style error
- DNS lookup timeouts may cause MX/SPF/DMARC checks to fail or return incomplete results
- Private or internal domains may not resolve publicly, causing false negatives on MX records
- Rate limiting or payment failure via x402 may block the request

## 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/spf-dmarc-auditor)

## Output

Returns a structured object indicating whether the email has valid syntax, whether the sending domain has live MX records enabling delivery, whether SPF and DMARC DNS records are present and configured, whether the provider is known as a disposable or burner email service, and whether the address appears to be a role account (e.g., info@, admin@).

## 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-5ad0f091/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)