# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from defi-yield.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 health.

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/spf-dmarc-auditor?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: defi-yield.agentdiet.dev
- Website: https://defi-yield.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/defi-yield-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-e6c7285e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iA6Oozd-5jmjKk7ZjAOVv

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 defi-yield-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-e6c7285e
```

Example prompt: Can you check whether 'john.doe@example.com' is a real, deliverable email address — specifically whether it passes syntax checks, isn't from a disposable provider, and has valid MX, SPF, and DMARC records set up on the domain?

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-signal email validation that goes beyond simple regex — specifically when you need live DNS MX reachability, SPF/DMARC policy inspection, and disposable/burner provider detection in a single call. Prefer it over basic syntax checkers when deliverability and domain security posture matter, such as before adding contacts to a CRM, validating user signups, or auditing outreach lists.

## Known failure modes

- Invalid or missing email parameter returns a validation error
- DNS lookup timeout if the domain's nameservers are slow or unreachable
- Unrecognized disposable providers may not be flagged if not in the blocklist
- Role-account detection limited to common prefixes; custom role accounts may be missed
- Non-existent domains return MX/SPF/DMARC as absent but won't indicate typos

## 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://defi-yield.agentdiet.dev/v1/spf-dmarc-auditor)

## Output

Returns a structured object indicating email syntax validity, whether the provider is a known disposable/burner service, whether the address appears to be a role account (e.g. admin@, info@), and the live DNS status of MX records (mail server reachability), SPF policy record, and DMARC policy record for the domain.

## 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/defi-yield-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-e6c7285e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from defi-yield.agentdiet.dev](https://www.zero.xyz/host/defi-yield.agentdiet.dev/llms.txt)