# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from cve-intel.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 detection, role account identification, and live DNS MX/SPF/DMARC record lookup.

## Facts

- Endpoint: GET https://cve-intel.agentdiet.dev/v1/mx-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: cve-intel.agentdiet.dev
- Website: https://cve-intel.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/cve-intel-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-9750e310
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bHV0pE7gWKs6qq6g749Mu

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 cve-intel-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-9750e310
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email deliverability check that goes beyond simple syntax validation — specifically when you need to detect disposable providers, verify live DNS MX/SPF/DMARC records, and identify role accounts in a single API call. Prefer it over basic regex validators when building lead qualification pipelines, signup fraud detection, or email campaign hygiene tools.

## Known failure modes

- Missing or malformed email parameter returns a validation error
- Domain has no MX records — email considered undeliverable
- DNS lookup timeout if the domain's nameservers are slow or unresponsive
- Unknown or newly registered disposable providers may not be flagged
- Role account detection may produce false negatives for non-standard prefixes

## 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://cve-intel.agentdiet.dev/v1/mx-check)

## Output

Returns a structured object indicating email syntax validity, whether the domain is a known disposable/burner provider, whether the address is a role account, and the live DNS lookup results for MX, SPF, and DMARC records, along with an overall deliverability assessment.

## 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/cve-intel-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-9750e310/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cve-intel.agentdiet.dev](https://www.zero.xyz/host/cve-intel.agentdiet.dev/llms.txt)