# 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 detection, role account flags, and live DNS MX, SPF, and DMARC record checks to assess real deliverability.

## Facts

- Endpoint: GET https://mesh.agentdiet.dev/v1/mx-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-48898b87
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1F15Q-emx4XZRcC6cn-RG

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-48898b87
```

Example prompt: Can you check whether john.doe@acmecorp.com is a real, deliverable email address — specifically whether the domain has live MX records, valid SPF and DMARC setup, and whether it looks like a disposable or role account?

## When to prefer this

Choose this endpoint when you need real-time, multi-layer email validation that goes beyond simple syntax checking — especially when you need to catch disposable addresses, role accounts, and verify actual DNS-level deliverability (MX, SPF, DMARC) in a single call. Prefer it over basic regex validators for CRM hygiene, fraud prevention, or pre-outreach list scrubbing.

## Known failure modes

- Missing or malformed email parameter returns validation error
- Domain has no DNS records — MX lookup returns empty result
- Disposable provider database may not cover newly created throwaway domains
- DNS resolution timeout if upstream DNS is slow or unreachable
- Non-existent TLD or purely syntactically invalid emails fail at parse stage

## 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 report indicating email syntax validity, whether the domain belongs to a known disposable/burner provider, whether the address is a role account (e.g. info@, admin@), and live DNS lookup results for MX, SPF, and DMARC records — giving a comprehensive deliverability and authenticity 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-48898b87/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)