# 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 status, role account detection, and live DNS MX, SPF, and DMARC record presence.

## Facts

- Endpoint: GET https://defi-yield.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: 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-9ea8c2a3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Zju732KSNqQq-6mTAz_We

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-9ea8c2a3
```

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

## When to prefer this

Choose this endpoint when you need a single API call that combines email syntax checking, live DNS MX/SPF/DMARC verification, disposable provider detection, and role account flagging — especially useful in B2B lead enrichment, user registration flows, or pre-campaign list hygiene where knowing both the address format and the domain's mail infrastructure matters. Prefer it over simple regex validators when live DNS lookups are required, and over full SMTP probing tools when you want a fast, non-intrusive check.

## Known failure modes

- Missing or malformed email parameter returns a validation error
- DNS lookup timeouts for domains with slow or unresponsive nameservers may produce incomplete MX/SPF/DMARC results
- Newly registered domains not yet propagated in DNS may incorrectly appear to lack MX records
- Disposable provider lists may not cover brand-new throwaway services
- Role account detection based on local-part heuristics may miss unusual role addresses

## 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-check)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the domain has live MX records (deliverability), whether the address belongs to a known disposable or burner email provider, whether it is a role-based account (e.g. admin@, info@), and whether the domain has SPF and DMARC DNS records configured.

## 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-9ea8c2a3/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)