# Is Email Hosted by Mailfence

> Is Email Hosted by Mailfence is a paid API for AI agents from email.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-23).

Checks whether a domain's email is hosted by Mailfence by looking up MX records via Cloudflare DoH and matching against Mailfence's mail-exchanger patterns

## Facts

- Endpoint: GET https://email.intel.rallylive.ca/email/hosted-by/mailfence?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/is-email-hosted-by-mailfence-bf6c1246
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fpuZiTDkmc_ox0TfJmGlq

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-mailfence-bf6c1246
```

Example prompt: Can you check if the domain example.com has its email hosted by Mailfence — I need to know if they use Mailfence and which MX records matched?

## When to prefer this

Use this endpoint when you need to definitively detect whether a specific domain routes its email through Mailfence, particularly for sales prospecting, email deliverability analysis, or pre-migration audits. Prefer the bulk sibling endpoint when checking multiple domains at once. Choose this over generic MX lookup tools when you specifically need Mailfence pattern matching without building your own logic.

## Known failure modes

- Domain does not exist or has no MX records — returns no match
- DNS lookup failure via Cloudflare DoH — may return an error or inconclusive result
- Domain uses Mailfence but with custom MX branding — may return false negative
- Invalid or malformed domain input — likely returns an error
- Temporary DNS resolution timeouts — may fail transiently

## How this service works

Is the domain's email hosted by mailfence? Looks up the MX records (Cloudflare DoH) and matches them against mailfence'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 on whether the domain's email is hosted by Mailfence, the full list of MX hosts found in DNS, and which MX hosts matched Mailfence'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-mailfence-bf6c1246/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)