# 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, and DMARC record existence.

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/disposable-email?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-1e3feca4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RxsMRb3XuhVc5p2Uyoje_

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-1e3feca4
```

Example prompt: Can you check if john.doe@example.com is a real, deliverable email address — not a disposable or burner account — and confirm whether the domain has valid MX, SPF, and DMARC records?

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-signal email check in a single call — covering syntax, disposable detection, role-account identification, and live DNS record validation (MX, SPF, DMARC) simultaneously. Prefer it over simple regex validators when you need real DNS lookup results, or over generic email verification APIs when you also need DMARC/SPF intelligence. Best suited for agent workflows that gate user onboarding, qualify B2B leads, or pre-screen mailing lists before sending.

## Known failure modes

- Missing or malformed email parameter returns a validation error
- DNS lookup timeouts may cause MX/SPF/DMARC checks to fail or return incomplete results
- Unknown or newly registered domains may have no DNS records, returning empty MX/SPF/DMARC results
- Disposable provider database may lag behind newly created burner services
- Payment failure (HTTP 402) if USDC balance is insufficient for the $0.005 per-call fee

## 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/disposable-email)

## Output

Returns a structured object indicating email syntax validity, whether the domain is from a known disposable/burner provider, whether the address is a role account (e.g. info@, admin@), and whether live DNS records exist for MX, SPF, and DMARC on the domain — giving a full deliverability and authenticity picture.

## 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-1e3feca4/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)