# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from preflight.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/DMARC record checks.

## Facts

- Endpoint: GET https://preflight.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: preflight.agentdiet.dev
- Website: https://preflight.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/preflight-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-21970bfb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_asvIG1SoM-17LLd60NYhW

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 preflight-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-21970bfb
```

Example prompt: Can you check if john.smith@acmecorp.com is a real, deliverable email address — and tell me whether the domain has valid MX, SPF, and DMARC records and if it's from a disposable or role account?

## When to prefer this

Choose this endpoint when you need a single-call, comprehensive email health check covering syntax, disposable provider detection, role account identification, and live DNS MX/SPF/DMARC validation — especially for B2B lead enrichment pipelines, sign-up fraud prevention, or pre-campaign deliverability audits. Prefer it over basic regex-only validators when you need real DNS verification, or over full email-sending test services when you just need a non-invasive read-only check.

## Known failure modes

- Invalid or malformed email string returns a syntax error or validation failure
- Domain has no MX records, indicating email cannot be delivered
- DNS lookup timeout if the domain's nameservers are slow or unreachable
- Missing or empty email parameter returns a 400 bad request
- Unknown or private TLDs may fail DNS resolution
- Payment required (HTTP 402) if x402 USDC micropayment is not supplied

## 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://preflight.agentdiet.dev/v1/spf-dmarc-auditor)

## Output

Returns a structured object indicating email syntax validity, whether the provider is a known disposable/burner service, whether the address is a role account (e.g. info@, support@), and live DNS lookup results for MX, SPF, and DMARC records on the domain — giving a comprehensive deliverability assessment.

## 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/preflight-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-21970bfb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from preflight.agentdiet.dev](https://www.zero.xyz/host/preflight.agentdiet.dev/llms.txt)