# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from serp-extract.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 status, role account detection, and live DNS MX, SPF, and DMARC record verification.

## Facts

- Endpoint: POST https://serp-extract.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: serp-extract.agentdiet.dev
- Website: https://serp-extract.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/serp-extract-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-77864da3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XHSU-QCPReuo5jcxGCNX_

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 serp-extract-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-77864da3 -d '<json body>'
```

Example prompt: Can you check if john.smith@example.com is a real, deliverable email address — specifically whether its domain has valid MX records, whether SPF and DMARC are set up, and whether it looks like a disposable or role account?

## When to prefer this

Choose this endpoint when you need a single-call, multi-signal email validation that combines syntax checking, real-time DNS MX/SPF/DMARC lookups, and disposable/role account detection — particularly in B2A or agent-driven workflows where HTTP 402 micropayment is acceptable. Prefer this over single-purpose SMTP ping tools when you need DNS record details alongside fraud signals.

## Known failure modes

- Invalid or malformed email address causes validation failure with syntax error
- Domain has no MX records — email flagged as undeliverable
- DNS lookup timeout or failure returns an error or partial result
- Disposable provider lists may have false negatives for newly created burner domains
- Response schema is loosely typed — callers must handle unexpected or missing fields gracefully

## 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://serp-extract.agentdiet.dev/v1/mx-deliverability-verifier)

## Output

Returns a structured object indicating email syntax validity, whether the domain has live MX records (and which), presence and content of SPF and DMARC DNS records, whether the provider is flagged as disposable or burner, and whether the local part is a role account (e.g. info@, admin@, noreply@).

## 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/serp-extract-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-77864da3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from serp-extract.agentdiet.dev](https://www.zero.xyz/host/serp-extract.agentdiet.dev/llms.txt)