# 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 2026-10-23).

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: POST https://preflight.agentdiet.dev/v1/email-verify?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-018cf917
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_d1Pn-kFEPw1yWZkkeKCSL

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-018cf917 -d '<json body>'
```

Example prompt: Can you verify whether john.doe@example.com is a real, deliverable email — check for valid syntax, working MX records, and whether it's from a disposable provider or a role account?

## When to prefer this

Choose this endpoint when you need a comprehensive, live DNS-backed email verification that goes beyond simple syntax checking — specifically when you need to detect disposable/burner addresses, role accounts, and verify SPF/DMARC policies in a single call. Prefer it over basic regex validators when onboarding users, validating sales leads, or screening email lists for deliverability risk. It is especially useful in agent workflows that require fraud prevention or CRM data quality enforcement.

## Known failure modes

- Invalid or missing email field returns a 400 error
- Non-existent domain with no DNS records may return MX not found
- Temporary DNS lookup failures may produce inconclusive results
- Rate limiting or payment failure via x402 returns 402 Payment Required
- Malformed email with valid-looking syntax may pass syntax check but fail MX lookup

## 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/email-verify)

## Output

Returns a structured object indicating: email syntax validity, whether the domain uses a known disposable/burner email provider, whether the address is a role account (e.g. info@, admin@), live DNS MX record presence and details, SPF record existence and content, and DMARC policy record existence and content — giving a complete deliverability and risk profile for the address.

## 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-018cf917/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)