Email Receiving Service for Developers

CloudMailin is an email receiving service built for developers. Our cloud-native infrastructure handles inbound email processing and delivers parsed messages to your application via HTTP POST in about a second.

No IMAP polling, no complex email parsing - just simple webhooks with JSON.

// Example Email to HTTP POST in the JSON Format
{
  "headers": {
    "Return-Path": "from@example.com",
    "Received": [
      "by 10.52.90.229 with SMTP id bz5cs75582vdb; Mon, 16 Jan 2012 09:00:07 -0800",
      "by 10.216.131.153 with SMTP id m25mr5479776wei.9.1326733205283; Mon, 16 Jan 2012 09:00:05 -0800",
      "from mail-wi0-f170.google.com (mail-wi0-f170.google.com [209.85.212.170]) by mx.google.com with ESMTPS id u74si9614172weq.62.2012.01.16.09.00.04 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 16 Jan 2012 09:00:04 -0800"
    ],
    "Date": "Mon, 16 Jan 2012 17:00:01 +0000",
    "From": "Message Sender <sender@example.com>",
    "To": "Message Recipient<to@example.co.uk>",
    "Message-ID": "<4F145791.8040802@example.com>",
    "Subject": "Test Subject",
    "Mime-Version": "1.0",
    "Content-Type": "multipart/alternative; boundary=------------090409040602000601080801",
    "Delivered-To": "to@example.com",
    "Received-SPF": "neutral (google.com: 10.0.10.1 is neither permitted nor denied by best guess record for domain of from@example.com) client-ip=10.0.10.1;",
    "Authentication-Results": "mx.google.com; spf=neutral (google.com: 10.0.10.1 is neither permitted nor denied by best guess record for domain of from@example.com) smtp.mail=from@example.com",
    "User-Agent": "Postbox 3.0.2 (Macintosh/20111203)"
  },
  "envelope": {
    "to": "to@example.com",
    "from": "from@example.com",
    "helo_domain": "localhost",
    "remote_ip": "127.0.0.1",
    "recipients": [
      "to@example.com",
      "another@example.com"
    ],
    "spf": {
      "result": "pass",
      "domain": "example.com"
    }
  },
  "plain": "Test with HTML.",
  "html": "<html><head>\n<meta http-equiv=\"content-type\" content=\"text/html; charset=ISO-8859-1\"></head><body\n bgcolor=\"#FFFFFF\" text=\"#000000\">\nTest with <span style=\"font-weight: bold;\">HTML</span>.<br>\n</body>\n</html>",
  "reply_plain": "Message reply if found.",
  "attachments": [
    {
      "content": "dGVzdGZpbGU=",
      "file_name": "file.txt",
      "content_type": "text/plain",
      "size": 8,
      "disposition": "attachment"
    },
    {
      "content": "Q2Fmw6kgbWVudQotIEVzcHJlc3NvIOKCrDMuNTAKLSBMYXR0w6kg4oKsNC4wMA==",
      "file_name": "menu.txt",
      "content_type": "text/plain",
      "size": 42,
      "disposition": "attachment"
    }
  ]
}

No More SMTP Servers

Stop managing mail servers. CloudMailin receives email and POSTs it to your webhook - no infrastructure required.
No More Polling

Forget IMAP connections and slow polling. Email arrives at your HTTP endpoint in about a second.
No Parsing Required

Stop wrestling with MIME, encodings, and attachments. We parse everything into clean, structured JSON.

How Inbound Email Processing Works

CloudMailin's email receiving service handles the complexity of receiving and parsing email so you don't have to.
- 1. Email Arrives
  
  Emails are sent to your CloudMailin address or your own custom domain. Our servers receive the inbound mail instantly.
- 2. We Parse It
  
  Our custom-built servers parse the email, extract attachments, and convert everything into a clean, structured format.
- 3. HTTP POST to Your App
  
  We deliver the parsed email to your webhook endpoint as JSON, multipart form data, or raw format - your choice.
Simple Webhook Integration

Receive emails with just a few lines of code. CloudMailin POSTs parsed JSON to your endpoint - no complex setup required.

Access headers, body content, and attachments directly from the request. Your webhook responds with 200 OK and you're done.
```
app.post('/incoming_mails', (req, res) => {
  const { envelope, headers, plain, html } = req.body;
  console.log(`Email from ${envelope.from}`);
  console.log(`Subject: ${headers.subject}`);
  res.status(200).json({ status: 'ok' });
});
```
Works with Any Language or Framework

Because CloudMailin delivers email via HTTP POST, you can use any programming language or framework. No SDK required - just parse the JSON.

Node.js, Python, Ruby, PHP, Go, Rust, TypeScript, Java, C#... if it can handle an HTTP request, it works with CloudMailin.

See examples for all languages
Secure by Default

Your inbound email is handled securely from the moment it arrives.
- TLS Encryption
  
  All connections support TLS. We'll even tell you if an email was sent without encryption so you can enforce it.
- SPF, DKIM & DMARC
  
  We can verify sender authentication and include the results in your webhook, helping you filter spam and phishing.
- Your Own Cloud Storage
  
  Large attachments can be stored directly in your AWS S3, Google Cloud Storage, or Azure Blob Storage.

Testimonials

Don't just take our word for it

Andreas Santoro

CTO, ExpressSteuer

CloudMailin has been instrumental in our growth at ExpressSteuer. The system is not only incredibly easy to implement, but also highly reliable and robust. What's more, their support team is simply amazing - always quick to respond and provide effective solutions to any challenge we encounter. We couldn't be more pleased with the service provided by CloudMailin!

Dan

CamelCamelCamel.com

Thanks for the rock solid decade

Francisco (Kiko) R.

Head of Engineering, ProFinda.com

The product is perfect, feature rich, nice and intuitive UI and great support. It was really easy to integrate it into our application. It enables our application to receive inbound traffic, to give better support to clients and to expand our mailing options.

Start Receiving Email in Minutes

The first 10,000 emails per month are free. No credit card required.

Get Started View Documentation

Email Receiving Service for Developers

No More SMTP Servers

No More Polling

No Parsing Required

How Inbound Email Processing Works

1. Email Arrives

2. We Parse It

3. HTTP POST to Your App

Simple Webhook Integration

Works with Any Language or Framework

Secure by Default

TLS Encryption

SPF, DKIM & DMARC

Your Own Cloud Storage

Don't just take our word for it

Start Receiving Email in Minutes