# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from mcp-security.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/DMARC record presence.

## Facts

- Endpoint: GET https://mcp-security.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: mcp-security.agentdiet.dev
- Website: https://mcp-security.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-security-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-7790279e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FxzGnfCRc1jwfCGJv-00i

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 mcp-security-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-7790279e
```

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

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call email validation that combines syntax checking, disposable provider detection, role account flagging, and live DNS-level MX/SPF/DMARC verification. It is especially valuable for agent workflows that must screen user-submitted emails before onboarding, mailing list addition, or outreach — and where you need real-time DNS evidence rather than just pattern-based heuristics. It supports x402 micropayment natively, making it suitable for autonomous agent pipelines without manual billing setup.

## Known failure modes

- Missing or invalid 'email' query parameter returns a 400 error
- Temporarily unresolvable DNS (transient network error) may cause MX/SPF/DMARC checks to fail even for valid domains
- Payment required (HTTP 402) if x402 micropayment header is not included or balance is insufficient
- Extremely new domains may have no DNS records yet and be flagged as undeliverable despite being legitimate
- Malformed but plausible-looking addresses may pass syntax checks but fail MX resolution

## 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://mcp-security.agentdiet.dev/v1/email-validator)

## Output

Returns a structured object indicating whether the email is syntactically valid, whether the domain is a known disposable/burner provider, whether it is a role-based address (e.g. info@, admin@), and live DNS lookup results for MX, SPF, and DMARC records, along with 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/mcp-security-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-7790279e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-security.agentdiet.dev](https://www.zero.xyz/host/mcp-security.agentdiet.dev/llms.txt)