# B2A Email Deliverability, MX, SPF & DMARC Verifier

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

## Facts

- Endpoint: GET https://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: agentdiet.dev
- Website: https://agentdiet.dev
- Canonical page: https://www.zero.xyz/c/agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-cb46c894
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8CqcOeM2bVHitAEeapvUp

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 agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-cb46c894
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — including whether it's a disposable provider, a role account, and whether the domain has valid MX, SPF, and DMARC records set up?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call email validation that combines syntax checking, disposable provider detection, role account flagging, and live DNS MX/SPF/DMARC verification — especially in agentic workflows where you want to screen leads, new user registrations, or outreach targets without stitching together multiple tools. Prefer it over basic regex validators when deliverability and fraud risk matter.

## Known failure modes

- Missing or malformed email parameter returns an error
- DNS lookup timeout if the domain's nameservers are slow or unresponsive
- Unknown or newly registered domain may return no MX/SPF/DMARC records even if legitimate
- Disposable provider lists may not cover every burner service, leading to false negatives
- Network-level failures could cause intermittent lookup 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://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 it is a role account (e.g. info@, noreply@), and the live DNS lookup results for MX, SPF, and DMARC records — effectively giving a full deliverability and trust profile for the email 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/agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-cb46c894/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdiet.dev](https://www.zero.xyz/host/agentdiet.dev/llms.txt)