# 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 2026-10-23).

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: POST https://agentdiet.dev/v1/email-check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- 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-72fde887
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_imWWw0oBfV1mDRlCTi4ot

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-72fde887 -d '<json body>'
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-signal email validation that goes beyond syntax checking — specifically when you need live DNS MX record resolution combined with SPF/DMARC policy checks and disposable provider detection in a single call. Prefer this over simple regex validators or single-signal checkers when building user onboarding flows, lead enrichment pipelines, or pre-send campaign hygiene checks where deliverability confidence matters.

## Known failure modes

- Malformed or empty email input returns a validation error
- DNS lookup timeout if the domain's nameservers are slow or unresponsive
- Domain does not exist — no MX records found, marked as undeliverable
- Rate limiting if too many requests are sent without idempotency keys
- Disposable provider list may not cover newly created burner domains
- SPF/DMARC records may be absent even for legitimate domains, causing false negatives

## 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/email-check)

## Output

Returns a structured object indicating: email syntax validity, whether the domain uses a known disposable/burner provider, whether the address is a role account (e.g. admin@, info@), live DNS MX record presence and values, SPF record presence and content, and DMARC policy presence and configuration — giving an overall deliverability assessment.

## 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-72fde887/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)