# 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 verification.

## Facts

- Endpoint: POST https://preflight.agentdiet.dev/v1/email?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-4483df1b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kD6daK0G9ghSEN1ZtlbEW

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-4483df1b -d '<json body>'
```

Example prompt: Can you check whether john.smith@examplecorp.com is a real, deliverable email — specifically look at its MX records, SPF and DMARC configuration, and whether it's a disposable or role address?

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-signal email validation that goes beyond simple format checking — specifically when live DNS MX/SPF/DMARC lookup matters, disposable/burner provider detection is required, or role-account identification is needed. Prefer it over basic regex validators when email deliverability and fraud prevention are the goals, and over general-purpose enrichment APIs when DNS correctness and spam-infrastructure signals are the priority.

## Known failure modes

- Invalid or malformed email input returns a syntax error
- DNS lookup timeout if the domain's nameservers are unresponsive
- Domain with no MX records flagged as undeliverable
- Unknown or novel disposable providers may not be detected
- Rate limits or payment failure (HTTP 402) if payment not properly handled

## 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)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the domain has live MX records confirming deliverability, whether SPF and DMARC DNS records are present and valid, whether the address belongs to a known disposable or burner email provider, and whether it is a role-based address (e.g. info@, support@, 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/preflight-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-4483df1b/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)