# 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, and DMARC record verification.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/mx-check?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-03252038
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4SJ449XZ2gmx2NJkr5ubd

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-03252038
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — including whether it's from a disposable provider, and whether the domain has valid MX, SPF, and DMARC records?

## When to prefer this

Choose this endpoint when you need a comprehensive, real-time email validation that goes beyond simple syntax checking — specifically when you need live DNS MX/SPF/DMARC verification combined with disposable provider detection and role account flagging in a single call. Prefer this over basic regex validators or static list checkers when deliverability accuracy and email security posture matter, such as before CRM imports, cold outreach campaigns, or user registration flows where fraud prevention is important.

## Known failure modes

- Invalid or malformed email address input — returns syntax error
- Domain has no MX records — flagged as undeliverable
- DNS lookup timeout — temporary failure on live record checks
- Disposable provider list may not cover all burner services — possible false negatives
- Rate limiting or payment failure via x402 protocol — call blocked

## 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/mx-check)

## Output

Returns a structured JSON object indicating email syntax validity, whether the domain belongs to a known disposable/burner provider, whether the address is a role account (e.g. info@, support@), and the live DNS lookup results for MX, SPF, and DMARC records — giving a complete deliverability and security posture assessment of the 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/mcp-security-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-03252038/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)