# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from llms-generator.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-23).

Validates an email address for syntax correctness, disposable/burner provider detection, role account status, and live DNS MX/SPF/DMARC record health.

## Facts

- Endpoint: POST https://llms-generator.agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: llms-generator.agentdiet.dev
- Website: https://llms-generator.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/llms-generator-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-c39a8ec1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GCkb9L4fRgR4GuuFdP7oX

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 llms-generator-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-c39a8ec1 -d '<json body>'
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — verify the syntax, check for active MX records, and flag it if it's from a disposable or burner provider?

## When to prefer this

Choose this endpoint when you need a comprehensive, live email deliverability check combining syntax validation, disposable provider detection, role account identification, and real-time DNS MX/SPF/DMARC record inspection in a single call — especially for B2B lead validation, signup fraud prevention, or pre-send email list hygiene workflows where bounce risk and spam filtering matter.

## Known failure modes

- Invalid or missing email parameter returns a validation error
- DNS lookup timeouts for domains with slow or unresponsive nameservers
- Domains with no MX records flagged as undeliverable even if they accept mail via A record fallback
- Newly registered domains may lack SPF/DMARC records and be flagged as misconfigured
- Payment required error (HTTP 402) if x402 micropayment is not provided

## 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://llms-generator.agentdiet.dev/v1/mx-deliverability-verifier)

## Output

Returns a structured object indicating: email syntax validity, whether the provider is a known disposable/burner service, whether the address is a role account (e.g. admin@, info@), live MX record presence and priority, SPF record existence and content, and DMARC policy record — giving a full deliverability picture for the queried 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/llms-generator-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-c39a8ec1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from llms-generator.agentdiet.dev](https://www.zero.xyz/host/llms-generator.agentdiet.dev/llms.txt)