Cloudflare Email Routing Skill for Claude

bun add [email protected] [email protected]

// src/email.ts
import { EmailMessage } from 'cloudflare:email';
import PostalMime from 'postal-mime';

export default {
  async email(message, env, ctx) {
    const parser = new PostalMime.default();
    const email = await parser.parse(await new Response(message.raw).arrayBuffer());

    console.log('From:', message.from);
    console.log('Subject:', email.subject);

    // Forward to destination
    await message.forward('[email protected]');
  }
};

{
  "name": "email-worker",
  "main": "src/email.ts",
  "compatibility_date": "2025-10-11",
  "node_compat": true  // Required!
}

bunx wrangler deploy

{
  "name": "my-worker",
  "main": "src/index.ts",
  "compatibility_date": "2025-10-11",
  "send_email": [
    {
      "name": "SES",
      "destination_address": "[email protected]"
    }
  ]
}

import { EmailMessage } from 'cloudflare:email';
import { createMimeMessage } from 'mimetext';

const msg = createMimeMessage();
msg.setSender({ name: 'App', addr: '[email protected]' });
msg.setRecipient('[email protected]');
msg.setSubject('Hello!');
msg.addMessage({
  contentType: 'text/plain',
  data: 'Email body here'
});

const message = new EmailMessage(
  '[email protected]',
  '[email protected]',
  msg.asRaw()
);

await env.SES.send(message);

const allowlist = ['[email protected]'];

if (!allowlist.includes(message.from)) {
  message.setReject('Not on allowlist');
  return;
}

await message.forward('[email protected]');

const blocklist = ['[email protected]'];

if (blocklist.includes(message.from)) {
  message.setReject('Blocked');
  return;
}

await message.forward('[email protected]');

const msg = createMimeMessage();
msg.setSender({ addr: '[email protected]' });
msg.setRecipient(message.from);
msg.setSubject(`Re: ${email.subject}`);
msg.addMessage({
  contentType: 'text/plain',
  data: 'Thanks for your email!'
});

const reply = new EmailMessage(
  '[email protected]',
  message.from,
  msg.asRaw()
);

await env.SES.send(reply);

const parser = new PostalMime.default();
const email = await parser.parse(await new Response(message.raw).arrayBuffer());

for (const attachment of email.attachments) {
  console.log('Filename:', attachment.filename);
  console.log('Type:', attachment.mimeType);
  console.log('Size:', attachment.content.byteLength);
}

async email(message, env, ctx) {
  const parser = new PostalMime.default();
  const email = await parser.parse(await new Response(message.raw).arrayBuffer());

  // Route based on subject
  if (email.subject.includes('[Support]')) {
    await message.forward('[email protected]');
  } else if (email.subject.includes('[Sales]')) {
    await message.forward('[email protected]');
  } else {
    await message.forward('[email protected]');
  }
}

message.from        // Sender email
message.to          // Recipient email
message.headers     // Email headers
message.raw         // Raw email stream
message.rawSize     // Size in bytes

// Methods
message.forward(address)        // Forward to address
message.setReject(reason)       // Reject email

email.from          // { name, address }
email.to            // [{ name, address }]
email.subject       // Subject line
email.text          // Plain text body
email.html          // HTML body
email.attachments   // Array of attachments
email.headers       // All headers

async email(message, env, ctx) {
  const parser = new PostalMime.default();
  const email = await parser.parse(await new Response(message.raw).arrayBuffer());

  // Create ticket in database
  await env.DB.prepare(
    'INSERT INTO tickets (email, subject, body, created_at) VALUES (?, ?, ?, ?)'
  ).bind(message.from, email.subject, email.text, Date.now()).run();

  // Send confirmation
  const msg = createMimeMessage();
  msg.setSender({ addr: '[email protected]' });
  msg.setRecipient(message.from);
  msg.setSubject('Ticket Created');
  msg.addMessage({
    contentType: 'text/plain',
    data: 'Your support ticket has been created.'
  });

  const confirmation = new EmailMessage(
    '[email protected]',
    message.from,
    msg.asRaw()
  );

  await env.SES.send(confirmation);
}

export default {
  async fetch(request, env, ctx) {
    // User signup
    const { email, name } = await request.json();

    const msg = createMimeMessage();
    msg.setSender({ name: 'App', addr: '[email protected]' });
    msg.setRecipient(email);
    msg.setSubject('Welcome!');
    msg.addMessage({
      contentType: 'text/html',
      data: `<h1>Welcome, ${name}!</h1>`
    });

    const message = new EmailMessage(
      '[email protected]',
      email,
      msg.asRaw()
    );

    await env.SES.send(message);

    return new Response('Welcome email sent!');
  }
};

async email(message, env, ctx) {
  const parser = new PostalMime.default();
  const email = await parser.parse(await new Response(message.raw).arrayBuffer());

  // Filter spam keywords
  const spamKeywords = ['viagra', 'lottery', 'prince'];
  const isSpam = spamKeywords.some(keyword =>
    email.subject.toLowerCase().includes(keyword) ||
    email.text.toLowerCase().includes(keyword)
  );

  if (isSpam) {
    message.setReject('Spam detected');
    return;
  }

  await message.forward('[email protected]');
}