# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from email-verify.agentdiet.dev, paid per call via MPP, $0.005000/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 lookups to assess deliverability.

## Facts

- Endpoint: GET https://email-verify.agentdiet.dev/a2a?utm_source=zero.xyz
- Price: $0.005000/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: email-verify.agentdiet.dev
- Website: https://email-verify.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/email-verify-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-f4a3bb6e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vsBAPsJ-WO4L6q6ihtJre

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 email-verify-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-f4a3bb6e
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — specifically whether it passes syntax checks, isn't from a disposable provider, and has valid MX, SPF, and DMARC DNS records?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call email validation that combines syntax checking, disposable/burner detection, role account flagging, AND live DNS record verification (MX, SPF, DMARC) in one request. Prefer it over basic syntax validators when you need to confirm a domain is actually configured to receive email, or over simple disposable-detection tools when you also need DNS-level deliverability signals. Well-suited for lead enrichment pipelines, fraud prevention at signup, and pre-send email hygiene checks.

## Known failure modes

- Invalid or malformed email address provided — returns syntax error
- Email domain has no MX records — flagged as undeliverable
- DNS lookup timeout for MX/SPF/DMARC — may return partial results
- Rate limiting or payment failure (HTTP 402) if x402 micropayment not completed
- Empty or missing email parameter — returns validation error

## 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://email-verify.agentdiet.dev/a2a)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the provider is a known disposable or burner service, whether the address appears to be a role account (e.g. info@, admin@), and the live DNS lookup results for MX, SPF, and DMARC records — allowing the agent to assess overall deliverability and trustworthiness of the 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"
  },
  "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/email-verify-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-f4a3bb6e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email-verify.agentdiet.dev](https://www.zero.xyz/host/email-verify.agentdiet.dev/llms.txt)