# 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 checks to confirm deliverability.

## Facts

- Endpoint: GET https://preflight.agentdiet.dev/v1/email-verify?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-2fe18696
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yoD4DJ_ppO7dTE3yGULw8

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-2fe18696
```

Example prompt: Can you check if john.doe@example.com is a real, deliverable email address — specifically whether the domain has valid MX records, isn't a disposable burner service, and passes SPF and DMARC checks?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call email hygiene check combining syntax validation, disposable provider detection, role account flagging, and live DNS MX/SPF/DMARC verification — especially in B2B lead enrichment, SaaS signup flows, or email campaign pre-flight workflows where deliverability confidence is critical. Prefer it over simple regex-only validators when DNS-level verification matters.

## Known failure modes

- Malformed or missing email parameter returns a 400/422 validation error
- DNS lookup timeouts may cause MX/SPF/DMARC checks to fail or return inconclusive results
- Newly registered domains may have incomplete DNS propagation leading to false negatives
- Private or internal email domains may not resolve publicly
- Payment failure (HTTP 402) if x402 USDC balance is insufficient

## 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 containing email syntax validity, whether the address belongs to a disposable or burner provider, whether it is a role account (e.g. info@, noreply@), and live DNS lookup results for MX, SPF, and DMARC records, collectively indicating whether the email is likely deliverable.

## 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-2fe18696/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)