# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from domain-osint.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 to assess deliverability.

## Facts

- Endpoint: POST https://domain-osint.agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Provider: domain-osint.agentdiet.dev
- Website: https://domain-osint.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/domain-osint-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-1ec14585
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4RGkbIPrDOcponRQjhS8y

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 domain-osint-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-1ec14585 -d '<json body>'
```

Example prompt: Can you check whether john.smith@acme-corp.io is a real, deliverable email — I want to know if the domain has MX, SPF, and DMARC records set up, and whether it's a disposable or role address before I add it to my CRM.

## When to prefer this

Choose this endpoint when you need a single-call, real-time check that combines email syntax validation, disposable/burner detection, role account flagging, and live DNS MX/SPF/DMARC verification in one response — particularly useful for CRM hygiene, signup fraud prevention, or pre-send deliverability audits. Prefer it over simple regex-only validators when live DNS truth is required, and over bulk email verification services when per-address micropayment pricing and agent-native x402 payment are preferred.

## Known failure modes

- Invalid or malformed email input returns a syntax error
- DNS lookup timeout if the domain's nameservers are unresponsive
- Domain does not exist (NXDOMAIN), resulting in no MX/SPF/DMARC records found
- Payment not settled (HTTP 402) if x402 micropayment header is missing or insufficient
- Rate limiting or network error from the upstream DNS resolver

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

## Output

Returns a structured object containing: email syntax validity, whether the domain uses a known disposable/burner provider, whether the address is a role account (e.g. info@, admin@), live MX record lookup results, SPF record presence and content, and DMARC policy status — giving a comprehensive deliverability and risk assessment for the submitted email 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/domain-osint-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-1ec14585/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from domain-osint.agentdiet.dev](https://www.zero.xyz/host/domain-osint.agentdiet.dev/llms.txt)