# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from 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://agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: agentdiet.dev
- Website: https://agentdiet.dev
- Canonical page: https://www.zero.xyz/c/agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-fefbce1a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AOQlz8Q_5wcQCxYS5PQn1

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 agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-fefbce1a
```

Example prompt: Can you verify whether john.smith@example.com is a real, deliverable email address — check if it passes syntax validation, isn't from a disposable provider, and has working MX, SPF, and DMARC records on the domain?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time, multi-signal email check — combining syntax validation, disposable/burner detection, role account flagging, and live DNS MX/SPF/DMARC verification — in a single call. Prefer it over basic syntax-only validators when deliverability and email security posture matter, such as before sending campaigns, qualifying leads, or accepting user registrations.

## Known failure modes

- Missing or malformed email parameter returns a validation error
- Domain has no MX records — email is undeliverable even if syntax is correct
- DNS timeout during live MX/SPF/DMARC lookup may return partial results
- Newly registered domains may not yet have propagated DNS records, causing false negatives
- Disposable provider list may not cover every newly created throwaway service

## 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://agentdiet.dev/v1/mx-deliverability-verifier)

## Output

Returns a structured object indicating whether the email address passes syntax validation, whether the domain is a known disposable/burner provider, whether it is a role account (e.g. info@, admin@), and the live DNS lookup results for MX, SPF, and DMARC records — giving a comprehensive deliverability and trust assessment for 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"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-fefbce1a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentdiet.dev](https://www.zero.xyz/host/agentdiet.dev/llms.txt)