# 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/email-validator?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-5f42b63a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_C7bJS1e8jjSCWyENuEw0b

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-5f42b63a
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — look at its MX records, SPF and DMARC setup, and flag it if it's a disposable or role account?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call email health check that combines syntax validation, live DNS MX/SPF/DMARC lookups, disposable provider screening, and role account detection — rather than calling separate DNS lookup or email ping services. It is especially useful for pre-CRM ingestion, lead qualification, signup fraud prevention, and pre-send campaign hygiene where all four dimensions matter.

## Known failure modes

- Invalid or missing email parameter returns an error
- DNS lookup timeout for obscure or newly registered domains
- False negatives on very new disposable providers not yet in blocklists
- Role account detection limited to common patterns
- Non-existent TLDs or malformed domains may produce ambiguous results

## 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-validator)

## Output

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

## 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-5f42b63a/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)