# 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 flags, and live DNS MX, SPF, and DMARC record presence.

## Facts

- Endpoint: POST https://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: agentdiet.dev
- Website: https://agentdiet.dev
- Canonical page: https://www.zero.xyz/c/agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-verifier-e9008196
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-Jdv3ylMZkrK9Qk-0dp7d

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-e9008196 -d '<json body>'
```

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

## When to prefer this

Choose this endpoint when you need a single call that combines email syntax validation, disposable-provider detection, role-account flagging, and live DNS MX/SPF/DMARC verification — rather than stitching together separate DNS query tools and blocklist APIs. It is especially well-suited for agent workflows that need to gate user onboarding, qualify leads before outreach, or audit an email list for deliverability risk, and it supports MCP and x402 micropayment natively for autonomous agent usage.

## Known failure modes

- Missing or malformed email address returns a 400 validation error
- DNS lookup timeout if the domain's nameservers are unresponsive
- Unknown or newly registered domains may lack MX/SPF/DMARC records, appearing as undeliverable even if legitimate
- Disposable provider detection may miss newly created throwaway services not yet in the blocklist
- Role account detection relies on heuristic prefix matching and may produce false positives for uncommon prefixes

## 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 email syntax validity, whether the domain uses a known disposable or burner provider, whether the address appears to be a role account, and live DNS lookup results including MX record presence, SPF record configuration, and DMARC policy record — enabling a full deliverability risk assessment for the queried 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-e9008196/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)