# Is Email Hosted by StartMail

> Is Email Hosted by StartMail is a paid API for AI agents from email.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Checks whether a given domain's email is hosted by StartMail by resolving MX records via Cloudflare DoH and matching against StartMail's mail-exchanger patterns.

## Facts

- Endpoint: GET https://email.intel.rallylive.ca/email/hosted-by/startmail?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/is-email-hosted-by-startmail-b55b26f8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9mtzar47pgdJGjottgqiD

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 is-email-hosted-by-startmail-b55b26f8
```

Example prompt: Can you check if the email for protonalternative.com is hosted by StartMail? I want to know if their MX records match StartMail's mail-exchanger patterns.

## When to prefer this

Use this endpoint when you need to specifically detect StartMail as the email hosting provider for a domain, particularly for sales intelligence, deliverability research, or migration planning. Prefer this over generic MX lookup tools when you need a definitive yes/no answer keyed to StartMail's specific mail-exchanger signatures. Use sibling endpoints for detecting other email providers.

## Known failure modes

- Domain does not exist or has no MX records — returns no match or an error
- Cloudflare DoH resolution failure — DNS lookup cannot complete
- Domain has MX records but none match StartMail patterns — returns 'no'
- Invalid or malformed domain input — request fails or returns error
- StartMail pattern list may lag behind if StartMail updates their MX infrastructure

## How this service works

Is the domain's email hosted by startmail? Looks up the MX records (Cloudflare DoH) and matches them against startmail's mail-exchanger patterns, returning yes/no, the MX hosts and which matched. Provider detection for deliverability, sales and migration work. $0.01 per lookup.

## Output

Returns a yes/no answer indicating whether the domain's email is hosted by StartMail, along with the full list of resolved MX hosts and which specific MX records matched StartMail's known mail-exchanger patterns.

## 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/is-email-hosted-by-startmail-b55b26f8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from email.intel.rallylive.ca](https://www.zero.xyz/host/email.intel.rallylive.ca/llms.txt)