# toolvend.dev Email Authentication Posture Check

> toolvend.dev Email Authentication Posture Check is a paid API for AI agents from toolvend.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Fetches and parses DMARC and SPF DNS records for a domain, scoring email authentication posture 0-100 with detailed findings and fix recommendations.

## Facts

- Endpoint: GET https://toolvend.dev/email-auth/:var1
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/toolvend-dev-email-authentication-posture-check-55910867
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RqKwaWwGYtfoMQgj-1Me2

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 toolvend-dev-email-authentication-posture-check-55910867
```

Example prompt: Can you check the email authentication posture for example.com — I want to see if DMARC and SPF are properly set up, get a score, and find out what needs to be fixed.

## When to prefer this

Use this endpoint when you need a quick, scored, and actionable assessment of a domain's email authentication posture (DMARC + SPF) without standing up your own DNS parsing infrastructure. It is ideal for security audits, vendor due diligence, pre-campaign deliverability checks, or automated monitoring pipelines. Prefer this over raw DNS lookup tools when you need structured scoring and human-readable fix recommendations rather than raw record text.

## Known failure modes

- Domain does not exist or is not registered — DNS lookup fails with no records returned
- Domain has no DMARC or SPF records published — returns score of 0 with findings indicating absence
- Malformed or syntactically invalid DMARC/SPF records — parsing errors noted in findings
- DNS resolution timeout — transient failure, retry recommended
- Invalid domain name format passed in URL path — likely returns 4xx error

## How this service works

Email authentication posture for a domain: DMARC + SPF records fetched, parsed, scored 0-100, with findings and fix recommendations.

## Output

Returns parsed DMARC and SPF DNS records for the queried domain, a numeric posture score from 0 to 100, a list of specific findings (e.g. missing p= policy, overly permissive SPF), and actionable fix recommendations prioritized by severity.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/toolvend-dev-email-authentication-posture-check-55910867/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from toolvend.dev](https://www.zero.xyz/host/toolvend.dev/llms.txt)