# DNS CNAME Lookup for webmail Subdomain

> DNS CNAME Lookup for webmail Subdomain is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Looks up the CNAME record of webmail.<domain> via Cloudflare DNS over HTTPS and reports whether it exists, its records, and TTL.

## Facts

- Endpoint: GET https://dns.intel.rallylive.ca/dns/host/webmail/cname?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dns-cname-lookup-for-webmail-subdomain-1f1ad6cb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2uF_6WIc8x1HmLkUUkxWo

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 dns-cname-lookup-for-webmail-subdomain-1f1ad6cb
```

Example prompt: Can you check if webmail.acmecorp.com has a CNAME DNS record configured — does it exist and what does it point to?

## When to prefer this

Use this endpoint when you need a fast, targeted check for whether the webmail subdomain of a specific domain is configured as a CNAME, without doing full subdomain enumeration. Prefer this over generic CNAME resolvers when you specifically care about the well-known 'webmail' host. It is ideal for email infrastructure audits, domain onboarding checks, and migration pre-flight validation.

## Known failure modes

- Domain has no webmail subdomain — returns NXDOMAIN or empty record set
- Domain does not exist at all — returns NXDOMAIN
- webmail subdomain has A/AAAA records but no CNAME — CNAME lookup returns nothing
- Malformed or missing domain input — request fails validation
- Cloudflare DoH upstream timeout or error — service may return error response

## How this service works

CNAME record of webmail.<domain>: looks up the webmail host under the domain you give (CNAME via Cloudflare DoH) and reports whether it exists, its records and TTL. Quick existence check for common hosts like webmail without enumerating subdomains. $0.01 per lookup.

## Output

Returns whether the webmail.<domain> CNAME record exists, the CNAME target value(s), the TTL, and the DNS response code (e.g. NOERROR or NXDOMAIN) as answered by Cloudflare DoH.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dns-cname-lookup-for-webmail-subdomain-1f1ad6cb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from dns.intel.rallylive.ca](https://www.zero.xyz/host/dns.intel.rallylive.ca/llms.txt)