# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from workflows.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 domain status, role account detection, and live DNS MX, SPF, and DMARC record presence.

## Facts

- Endpoint: GET https://workflows.agentdiet.dev/v1/email-verify?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: workflows.agentdiet.dev
- Website: https://workflows.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/workflows-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-9ae3af34
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5fhJQ2jSQ_2gM8F_ZU8z1

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 workflows-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-9ae3af34
```

Example prompt: Can you check whether john.doe@acmecorp.com is a real, deliverable email — verify its MX records exist, whether it's from a disposable provider, and if SPF and DMARC are configured for the domain?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call check covering email syntax, deliverability (live MX lookup), email security records (SPF/DMARC), and fraud signals (disposable domain, role account) together — rather than running separate DNS lookups or using a basic syntax-only validator. Especially useful for lead enrichment pipelines, signup fraud prevention, and pre-send campaign validation.

## Known failure modes

- Missing or invalid email parameter returns a validation error
- Non-existent domain causes MX/SPF/DMARC lookups to return negative or empty results
- Temporary DNS resolution failures may cause lookup timeouts
- Disposable provider lists may not cover all burner services, leading to false negatives
- Payment not completed (HTTP 402) if x402 payment header is missing or insufficient

## 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://workflows.agentdiet.dev/v1/email-verify)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the domain uses a known disposable/burner provider, whether the address is a role account (e.g. info@, admin@), and whether live DNS MX, SPF, and DMARC records exist and are properly configured for the domain.

## 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/workflows-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-9ae3af34/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from workflows.agentdiet.dev](https://www.zero.xyz/host/workflows.agentdiet.dev/llms.txt)