# 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 provider status, role account detection, and live DNS MX, SPF, and DMARC record presence.

## Facts

- Endpoint: GET https://workflows.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: 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-af408b44
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rpYGtuFF888ypkR1PAD1B

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-af408b44
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — specifically whether it passes syntax checks, isn't from a disposable provider, and has valid MX, SPF, and DMARC DNS records?

## When to prefer this

Choose this endpoint when you need a combined, real-time check of email syntax, disposable provider detection, role account identification, and live DNS MX/SPF/DMARC verification in a single API call — particularly useful for lead enrichment pipelines, signup validation, or outbound email campaign hygiene where you need to confirm both the address format and the domain's mail infrastructure before sending.

## Known failure modes

- Missing or malformed email parameter returns a validation error
- Domains with no public DNS records may return MX/SPF/DMARC as absent rather than invalid
- Temporary DNS timeouts may cause inconclusive MX lookup results
- Very new or private domains may not have SPF/DMARC configured, flagged as missing records
- Rate limiting or payment failure (x402) may block repeated calls

## 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/mx-check)

## Output

Returns a structured object indicating whether the email passed syntax validation, whether the domain belongs to a known disposable or burner provider, whether the address is a role account (e.g. info@, admin@), and the live DNS status of MX, SPF, and DMARC records for the email's domain, giving a comprehensive deliverability picture.

## 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-af408b44/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)