# 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 2026-10-21).

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

## Facts

- Endpoint: GET https://mesh.agentdiet.dev/v1/email-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-c78dd6eb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bFAXDf4PeEgEczPI-oXwG

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-c78dd6eb
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — make sure it's not a disposable provider or a role account, and confirm the domain has valid MX, SPF, and DMARC records?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time single-call check combining syntax validation, disposable provider detection, role account flagging, and live DNS MX/SPF/DMARC verification — particularly in B2B lead enrichment, sign-up fraud prevention, or pre-campaign email scrubbing workflows. Prefer it over basic regex-only validators when DNS-level deliverability confirmation is required.

## Known failure modes

- Missing or invalid email parameter returns a 400-level error
- DNS lookup timeouts may cause incomplete MX/SPF/DMARC results for slow or unresponsive nameservers
- Payment required error (HTTP 402) if x402 micropayment is not submitted
- Disposable provider list may not cover all newly created burner domains
- Role account detection is heuristic and may have false positives for legitimate department addresses

## 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/email-check)

## Output

Returns a structured object indicating email syntax validity, whether the domain is a known disposable/burner provider, whether the local part is a role account (e.g. admin, info, support), and live DNS lookup results for MX records (mail server existence), SPF record (sender policy), and DMARC record (domain-based message authentication), collectively indicating whether the address is likely deliverable.

## 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-c78dd6eb/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)