# 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 checks to assess deliverability.

## Facts

- Endpoint: GET https://workflows.agentdiet.dev/v1/mx-deliverability-verifier?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-13655da4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9OJbRqqlHIsqgOyZBzRhI

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-13655da4
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email — I want to know if the domain has valid MX records, whether it's from a disposable provider, and if SPF and DMARC are configured?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email validation that goes beyond simple syntax checking — specifically when you need live DNS MX/SPF/DMARC verification combined with disposable provider detection and role account identification in a single call. Ideal for pre-campaign list hygiene, sign-up fraud prevention, and CRM lead quality scoring.

## Known failure modes

- Missing or malformed email address parameter returns a validation error
- DNS lookup timeout if the domain's nameservers are unresponsive
- Domain with no MX records returns deliverability failure
- Unknown or novel disposable provider may not be flagged
- Rate limiting or payment failure (HTTP 402) if micropayment is not settled

## 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-deliverability-verifier)

## Output

Returns a structured report indicating whether the email syntax is valid, whether the domain is associated with a known disposable/burner provider, whether the address appears to be a role account (e.g. info@, noreply@), and the live DNS status of MX, SPF, and DMARC records — collectively indicating whether the email 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/workflows-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-13655da4/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)