Listmonk Bounce Processing using Cloudflare Route to workers.yml

worker.js

const fromAdress = "postmaster@example.com";
const webhook = "https://listmonk.example.com/webhooks/bounce";
const auth = "user:password";

export default {
  async email(message, env, ctx) {
    if (message.from != fromAdress) {
      message.setReject("This is a Noreply Address");
      return;
    }
    let rawEmail = new Response(message.raw)
    let body = await rawEmail.text()
    // Match original receipient in bounce Mail
    let toMail = new RegExp("(?<=Original-Recipient: rfc822;).*?(?=\\r\\n)").exec(body);
    console.log(toMail);
    if (!toMail) {
      message.setReject("No bounce mail found");
      return;
    }
    let data = {"email": toMail[0], "source": "CloudflareWorker", "type": "hard"};
    // Optionaly Match campaignUuid
    let campaignUuid = new RegExp("(?<=X-Listmonk-Campaign: ).*?(?=\\r\\n)").exec(body);
    if (campaignUuid) {
      data["campaign_uuid"] = campaignUuid[0];
    }
    await fetch(webhook, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        "Authorization": "Basic " + btoa(auth)
      },
      body: JSON.stringify(data)
    });
  }
}