# B2A Email Deliverability, MX, SPF & DMARC Verifier

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

## Facts

- Endpoint: GET https://email-verify.agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: email-verify.agentdiet.dev
- Website: https://email-verify.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/email-verify-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-4cb33369
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6tpQXQT-JAdV0iWP-DaeP

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 email-verify-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-4cb33369
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email — verify its syntax, whether the domain has working MX records, and whether it's a disposable or role-based address?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email deliverability check that goes beyond simple regex validation — specifically when you need live DNS MX/SPF/DMARC lookups combined with disposable provider and role account detection in a single call. Prefer it over simple syntax validators when list hygiene, lead qualification, or fraud prevention is the goal.

## Known failure modes

- Invalid or malformed email input returns a syntax error
- DNS lookup timeout if the domain's nameservers are slow or unreachable
- Unknown or newly registered domains may lack MX/SPF/DMARC records, resulting in undeliverable flags
- Payment required (HTTP 402) if x402 micropayment is not included or insufficient
- Disposable provider lists may not cover every burner service, leading to false negatives

## 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://email-verify.agentdiet.dev/v1/mx-deliverability-verifier)

## Output

Returns a structured object indicating: email syntax validity, whether the domain has live MX records, presence of SPF and DMARC DNS records, whether the provider is a known disposable/burner service, and whether the address is a role account (e.g. info@, admin@, noreply@).

## 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/email-verify-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-4cb33369/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email-verify.agentdiet.dev](https://www.zero.xyz/host/email-verify.agentdiet.dev/llms.txt)