# Is Email Hosted by Proton Mail

> Is Email Hosted by Proton Mail 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 domain's email is hosted by Proton Mail by looking up its MX records via Cloudflare DoH and matching against Proton Mail's mail-exchanger patterns.

## Facts

- Endpoint: GET https://email.intel.rallylive.ca/email/hosted-by/proton-mail?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-proton-mail-76448a03
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_M7EsQLpDDe2CnfXv4QGEi

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-proton-mail-76448a03
```

Example prompt: Can you check whether fastmail.com is currently hosting its email through Proton Mail — I need to know if their MX records match Proton Mail's patterns?

## When to prefer this

Use this endpoint when you specifically need to determine if a domain's email is hosted by Proton Mail rather than another provider. It is ideal for sales intelligence workflows, email migration assessments, or privacy-focused company segmentation. Prefer this over generic MX lookup tools when you need provider-specific pattern matching against Proton Mail's infrastructure, and when you want a simple yes/no answer with supporting evidence rather than raw DNS data.

## Known failure modes

- Domain not found or does not exist — returns no match with empty MX records
- Domain has no MX records configured — returns no with empty host list
- Cloudflare DoH lookup timeout or DNS resolution failure — service error response
- Invalid domain format provided — returns error or no result
- Domain uses a Proton Mail custom domain alias not matching known patterns — may return false negative

## How this service works

Is the domain's email hosted by proton mail? Looks up the MX records (Cloudflare DoH) and matches them against proton-mail'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 Proton Mail, along with the full list of MX hosts found via Cloudflare DoH and which specific hosts matched Proton Mail's 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-proton-mail-76448a03/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)