# 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/DMARC record checks to assess real deliverability.

## Facts

- Endpoint: POST https://mesh.agentdiet.dev/v1/mx-deliverability-verifier?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-52721ec6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_adUMuj1zKJAYQ0eFI9sQo

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-52721ec6 -d '<json body>'
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — verify the syntax, check if it's a disposable or burner provider, and confirm the domain has valid MX, SPF, and DMARC DNS records?

## When to prefer this

Choose this endpoint when you need a comprehensive, live email deliverability check that goes beyond simple syntax validation — covering disposable provider detection, role account identification, and real-time DNS MX/SPF/DMARC record verification in a single call. Prefer it over lightweight regex-only validators when lead quality, inbox deliverability, or fraud prevention are at stake.

## Known failure modes

- Malformed or missing email input returns a 400 validation error
- DNS lookup timeouts may result in indeterminate MX/SPF/DMARC status
- Novel or very new disposable providers may not be flagged as such
- Payment not provided or payment failure returns HTTP 402
- Internal DNS resolution errors may return 5xx responses

## 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-deliverability-verifier)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the domain is a known disposable/burner provider, whether it is a role-based address (e.g. info@, noreply@), and whether the domain has valid MX, SPF, and DMARC DNS records, along with overall deliverability assessment.

## 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-52721ec6/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)