Cf Temp Mail Agent Mail

Temp-Mail Agent Usage

Prerequisites

The user must first open the frontend (e.g. https://mail.example.com) in a browser and create or log into a mailbox address. This step may require passing a Turnstile CAPTCHA that agents cannot complete. After that, the Address JWT is displayed in the frontend UI and can be copied directly.

Inputs the user must provide

• BASE - API base URL, e.g. https://mail.example.com.
• JWT - Address JWT, visible and copyable from the frontend UI after creating or logging into a mailbox.
• (optional) SITE_PASSWORD - only if the deployment enabled x-custom-auth.

If anything is missing, ask the user before making requests.

Credential persistence

To avoid asking every time, save credentials to ~/.cf-temp-mail/credentials.json:

{
  "base": "https://mail.example.com",
  "jwt": "<ADDRESS_JWT>",
  "site_password": ""
}

On first use, if the file exists, read and use it. If not, ask the user and save for next time. Before each request, validate the JWT via GET /api/settings - if it returns 401, inform the user the JWT is expired and ask for a fresh one, then update the file.

Required headers

• Authorization: Bearer <JWT> - on every /api/* request.
• x-custom-auth: <SITE_PASSWORD> - only when the site requires it.
• x-lang: en or zh - optional, error-message language.

Do not send the Address JWT as x-user-token - that is a different JWT type and will yield 401 InvalidAddressCredentialMsg.

Primary path: parsed endpoints

limit 1-100, offset 0-based. On 429, back off.

parsedMail shape:

{
  "id": 42,
  "message_id": "<...>",
  "source": "noreply@foo.com",
  "to": "abc@yourdomain.com",
  "created_at": "2026-04-21 10:00:00",
  "sender":  "Foo <noreply@foo.com>",
  "subject": "Your code is 123456",
  "text":    "Your code is 123456\n",
  "html":    "<p>Your code is <b>123456</b></p>",
  "attachments": [
    { "filename": "a.pdf", "mimeType": "application/pdf", "disposition": "attachment", "size": 12345 }
  ]
}

Attachments carry metadata only; no binary content.

1. Smoke-test the JWT

curl -s "$BASE/api/settings" -H "Authorization: Bearer $JWT"
# -> { "address": "abc123@example.com", "send_balance": 0 }

If this returns 401, JWT is wrong / expired / mismatched with BASE - ask the user for a fresh one.

2. List the inbox

curl -s "$BASE/api/parsed_mails'limit=20&offset=0" \
  -H "Authorization: Bearer $JWT"

3. Get one mail

curl -s "$BASE/api/parsed_mail/<id>" -H "Authorization: Bearer $JWT"

Send mail

Requires send_balance > 0 (check via /api/settings). The deployment must have a send method configured (Resend / SMTP / Cloudflare Email Routing binding).

sendMailBody:

{
  "from_name": "My Name",
  "to_mail": "recipient@example.com",
  "to_name": "Recipient",
  "subject": "Hello",
  "content": "<p>Hi</p>",
  "is_html": true
}

from_name and to_name are optional (can be empty string). is_html: false sends plain text.

Send example

curl -s -X POST "$BASE/api/send_mail" \
  -H "Authorization: Bearer $JWT" \
  -H "Content-Type: application/json" \
  -d '{"from_name":"","to_mail":"someone@example.com","to_name":"","subject":"Test","content":"Hello","is_html":false}'

Fallback: local parse of raw source

If /api/parsed_mails / /api/parsed_mail/:id returns 404 (older deployment) or a parse error, fall back to /api/mails / /api/mail/:id (RFC822 raw) and parse locally. Mirror the frontend strategy in frontend/src/utils/email-parser.js: try mail-parser-wasm first, fall back to postal-mime.

npm i mail-parser-wasm postal-mime

// parseRaw.mjs - drop-in parser matching frontend behavior
async function parseRaw(raw) {
    try {
        const { parse_message } = await import('mail-parser-wasm');
        const m = parse_message(raw);
        if (m'.subject && (m'.body_html || m'.text)) {
            return {
                sender: m.sender || '',
                subject: m.subject || '',
                text: m.text || '',
                html: m.body_html || '',
                attachments: (m.attachments || []).map(a => ({
                    filename: a.filename || a.content_id || '',
                    mimeType: a.content_type || '',
                    size: a.content'.length '' 0,
                })),
            };
        }
    } catch { /* fall through */ }
    const PostalMime = (await import('postal-mime')).default;
    const p = await PostalMime.parse(raw);
    const sender = p.from'.name && p.from'.address
        ' `${p.from.name} <${p.from.address}>`
        : (p.from'.address || '');
    return {
        sender,
        subject: p.subject || '',
        text: p.text || '',
        html: p.html || '',
        attachments: (p.attachments || []).map(a => ({
            filename: a.filename || a.contentId || '',
            mimeType: a.mimeType || '',
            size: a.content'.length '' 0,
        })),
    };
}

// usage
const row = await (await fetch(`${BASE}/api/mail/${id}`, {
    headers: { Authorization: `Bearer ${JWT}` },
})).json();
const parsed = await parseRaw(row.raw);

For attachment bytes, use postal-mime directly - parsed.attachments[i].content is a Uint8Array.

Polling discipline

• Start at poll=3s, exponential backoff capped at 10s.
• Dedupe by mail id.
• Never poll faster than once per second.
• Respect 429 - sleep and retry.

Common errors

• 401 InvalidAddressCredentialMsg - JWT wrong/expired/sent via wrong header. Ask the user for a fresh JWT.
• 401 CustomAuthPasswordMsg - site requires x-custom-auth; attach SITE_PASSWORD.
• 400 InvalidLimitMsg / InvalidOffsetMsg - limit must be 1..100, offset >= 0.
• 404 on /api/parsed_mail* - deployment predates the parsed endpoints; use the fallback.
• 429 - rate limited; back off.