# 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 2026-10-21).

Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX, SPF, and DMARC record presence.

## Facts

- Endpoint: GET https://domain-osint.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: 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-7840e4c9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QlL0i0PQOIQaY6h1Ved_U

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-7840e4c9
```

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

## When to prefer this

Choose this endpoint when you need a combined, live check of email syntax, disposable-provider detection, role-account classification, and actual DNS record verification (MX, SPF, DMARC) in a single call. Prefer it over simple regex validators when real deliverability matters, or over generic WHOIS tools when you specifically need email-layer DNS hygiene rather than domain registration data.

## Known failure modes

- Missing or malformed email parameter returns a 400 validation error
- DNS lookup timeouts for domains with slow or unresponsive nameservers
- Disposable provider list may not cover newly created burner services
- MX records may exist but mailboxes may still be inactive (false positive on deliverability)
- Payment required (HTTP 402) if x402 micropayment is not fulfilled
- Domain may have MX records pointing to non-functional mail servers

## 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/mx-check)

## Output

Returns a structured report on the email address including: syntax validity result, whether the domain uses a known disposable/burner provider, whether the address is a role account (e.g. admin@, noreply@), live DNS MX record lookup results, SPF record presence and content, and DMARC record presence and policy — collectively indicating whether the address is likely deliverable and trustworthy.

## 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-7840e4c9/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)