# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from mesh.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, and DMARC record presence.

## Facts

- Endpoint: POST https://mesh.agentdiet.dev/v1/mx-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: mesh.agentdiet.dev
- Website: https://mesh.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mesh-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-f7863447
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gGBpgKenX3x6woX-tvPjZ

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 mesh-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-f7863447 -d '<json body>'
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — specifically whether it's a disposable provider, has valid MX records, and passes SPF and DMARC checks?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call email health check covering syntax, DNS deliverability, disposable provider detection, role account identification, and SPF/DMARC policy verification — especially in B2B lead enrichment, SaaS signup flows, or pre-campaign list hygiene where false positives from burner addresses are costly. Prefer it over simple regex-only validators when live DNS confirmation is required, and over domain-only DNS tools when you need email-address-level analysis including local-part role detection.

## Known failure modes

- Invalid or malformed email string causes syntax validation failure with no DNS lookup performed
- Domain has no MX records — returns valid syntax but undeliverable status
- DNS timeout or resolution failure for the domain results in inconclusive MX/SPF/DMARC fields
- Payment not attached or insufficient — HTTP 402 response blocking the call
- Rate limiting or network errors from the upstream DNS resolver causing intermittent failures

## 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://mesh.agentdiet.dev/v1/mx-check)

## Output

Returns a structured object indicating: email syntax validity, whether the domain belongs to a known disposable/burner provider, whether the local part is a role-based account (e.g. support, admin, noreply), and live DNS lookup results for MX records (with hostnames/priorities), SPF record presence and content, and DMARC record presence and policy — giving a holistic deliverability and trust assessment for the address.

## 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/mesh-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-f7863447/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mesh.agentdiet.dev](https://www.zero.xyz/host/mesh.agentdiet.dev/llms.txt)