# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from defi-yield.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 detection, role account flags, and live DNS checks (MX, SPF, DMARC) to confirm deliverability.

## Facts

- Endpoint: GET https://defi-yield.agentdiet.dev/v1/email-validator?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: defi-yield.agentdiet.dev
- Website: https://defi-yield.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/defi-yield-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-5bbc8bfc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4E3r63ODL-b44i90x_a0j

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 defi-yield-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-5bbc8bfc
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email validation that goes beyond simple regex — specifically when you want live DNS MX/SPF/DMARC checks combined with disposable-provider detection and role-account flagging in a single call. It is ideal for pre-send deliverability checks, onboarding form validation, or CRM hygiene tasks where false positives (accepting bad emails) are costly.

## Known failure modes

- Missing or empty email parameter returns a validation error
- Malformed email string may cause syntax-fail result without DNS lookup
- DNS lookup timeout for obscure or newly registered domains may result in inconclusive MX/SPF/DMARC status
- Rate limiting or payment failure (x402) returns a 402 response requiring payment
- Domain exists but has no MX records — correctly flagged as undeliverable

## 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://defi-yield.agentdiet.dev/v1/email-validator)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the domain is from a known disposable/burner provider, whether the address is a role account (e.g. admin@, noreply@), and the live DNS status of MX, SPF, and DMARC records for the email's domain — giving a comprehensive deliverability verdict.

## 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/defi-yield-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-5bbc8bfc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from defi-yield.agentdiet.dev](https://www.zero.xyz/host/defi-yield.agentdiet.dev/llms.txt)