# 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 2026-10-21).

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: GET https://serp-extract.agentdiet.dev/v1/email-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- 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-3896ec6e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Lt2_0RK309PLnUoqPDx4n

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-3896ec6e
```

Example prompt: Can you check whether john.doe@tempmail.org is a real, deliverable email — specifically whether it has valid MX records, passes SPF and DMARC checks, and whether it looks like a disposable or burner address?

## When to prefer this

Use this endpoint when you need a comprehensive, multi-layer email validation that goes beyond simple syntax checks — specifically when you need live DNS MX record resolution, SPF and DMARC policy verification, and disposable/role-account detection in a single call. Prefer this over basic regex validators when building user signup flows, cleaning B2B lead lists, or qualifying contacts before cold outreach.

## Known failure modes

- Missing or malformed email parameter returns a 400-level error
- DNS lookup timeouts may cause MX/SPF/DMARC checks to be inconclusive
- Private or internal domains with no public DNS records may return false negatives
- Newly registered domains may lack SPF/DMARC records even if legitimate
- Disposable provider databases may not cover all burner services, leading to missed detections

## 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-check)

## Output

Returns a structured object indicating: whether the email syntax is valid, whether the domain is associated with a known disposable or burner provider, whether the address appears to be a role account (e.g. info@, support@), whether live DNS MX records exist and are resolvable, and whether SPF and DMARC records are present and well-formed on the domain.

## 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"
  },
  "limit": {
   "type": "integer",
   "default": 20,
   "maximum": 100,
   "minimum": 1,
   "description": "Maximum number of items to return per page (1-100)"
  },
  "cursor": {
   "type": "string",
   "description": "Opaque pagination cursor for fetching the next page"
  }
 }
}
```

## 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-3896ec6e/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)