# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from x402-audit.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 status, role account detection, and live DNS MX, SPF, and DMARC record health.

## Facts

- Endpoint: GET https://x402-audit.agentdiet.dev/v1/email?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: x402-audit.agentdiet.dev
- Website: https://x402-audit.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/x402-audit-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-bdea972c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7kagpx6kqiQc3jyuZujqK

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 x402-audit-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-bdea972c
```

Example prompt: Can you verify whether john.doe@example.com is a real, deliverable email address — check its syntax, DNS MX records, SPF, DMARC, and flag it if it looks like a disposable or role account?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email validation that goes beyond simple syntax checks — specifically when you need live DNS MX record verification plus SPF/DMARC policy inspection and disposable/role account detection in a single call. It is well-suited for B2B lead enrichment pipelines, anti-fraud signup flows, and pre-send deliverability audits where knowing the full DNS health of an email domain matters.

## Known failure modes

- Missing or malformed email parameter returns a 400-level error
- DNS lookup timeouts may affect MX/SPF/DMARC results for slow nameservers
- Newly registered domains may lack DNS propagation, causing false negatives
- Payment failure via x402 returns HTTP 402, blocking the request
- Some disposable providers may not be in the known blocklist, causing 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://x402-audit.agentdiet.dev/v1/email)

## Output

Returns a structured object indicating whether the email passes syntax checks, whether the domain has live MX records confirming deliverability, whether SPF and DMARC DNS records are present and valid, whether the provider is flagged as disposable or a burner service, and whether the address is a role account (e.g. admin@, info@, 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/x402-audit-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-bdea972c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-audit.agentdiet.dev](https://www.zero.xyz/host/x402-audit.agentdiet.dev/llms.txt)