# 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 checks.

## Facts

- Endpoint: POST https://serp-extract.agentdiet.dev/v1/email-verify?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-c9c66c82
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LvI9oZJ9VtqDgGaHi5Dhl

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-c9c66c82 -d '<json body>'
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-signal email verification that goes beyond simple syntax checking — specifically when you need live DNS MX reachability, SPF/DMARC policy presence, disposable provider detection, and role account identification in a single API call. It is ideal for B2B lead enrichment pipelines, signup fraud prevention, and pre-campaign email hygiene checks where false positives from undeliverable addresses are costly.

## Known failure modes

- Invalid or malformed email input — endpoint may return a syntax failure flag or error
- Domain has no MX records — reported as undeliverable even if syntax is correct
- DNS lookup timeout or transient DNS failure — may result in inconclusive MX/SPF/DMARC results
- Rate limiting or payment failure via x402 — request rejected with 402 status
- Unknown or very new domain with no DNS history — may return incomplete record checks

## 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/email-verify)

## Output

Returns a structured object indicating whether the email passed syntax validation, whether the domain has live MX records (confirming mail can be received), whether SPF and DMARC DNS records are configured, whether the provider is identified as a disposable/burner email service, and whether the address is a role account (e.g., info@, support@).

## 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-c9c66c82/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)