# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from domain-osint.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/DMARC record checks to assess deliverability.

## Facts

- Endpoint: POST https://domain-osint.agentdiet.dev/v1/email-validator?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: domain-osint.agentdiet.dev
- Website: https://domain-osint.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/domain-osint-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-99c626d2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HYsFPI9XmYFSOtq_7LnWn

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 domain-osint-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-99c626d2 -d '<json body>'
```

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

## 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 detection, and role account flagging — especially in fraud prevention, lead qualification, or pre-send list hygiene workflows where bounce risk and fake signups are a concern. Prefer it over simple regex-only validators when actual deliverability and domain security posture matter.

## Known failure modes

- Invalid or missing email input returns a 400 error with validation message
- DNS lookup timeout for MX/SPF/DMARC if the domain's nameservers are slow or unresponsive
- Domain does not exist resulting in no MX records found
- Payment required (402) if x402 USDC micropayment header is not provided
- Ambiguous results for newly registered domains with incomplete DNS propagation

## 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://domain-osint.agentdiet.dev/v1/email-validator)

## Output

Returns a structured JSON object indicating whether the email address passes syntax checks, whether the domain has valid live MX records, the presence and validity of SPF and DMARC DNS records, whether the provider is a known disposable/burner email service, and whether the address is a role-based account (e.g. info@, 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/domain-osint-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-99c626d2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from domain-osint.agentdiet.dev](https://www.zero.xyz/host/domain-osint.agentdiet.dev/llms.txt)