# Send messages

You can send requests either with content type application/json or with application/x-www-form-urlencoded. Other content types are not allowed and will return an error.

Depending on the content type, the notation of receivers, carbon copies (CC) or blind carbon copies (BCC) vary. There is no limit how many receivers, CC or BCC addresses you specify.

# Requests

# Fields

For detailed usage of these fields, f. ex setting multiple recipients, check out the examples below.

Description Type, Example Field name
Sender name string,
Example: John Doe
Sender addres string,
Example: [email protected]
Recipiens array to
Carbon copy array cc
Blind carbon copy array bcc
Subject string subject
Message string message
Define the content type of the message string,
Example: html or text
Redirect after sending string,
Example: https://www.dmain.com

# JSON request example

curl -X POST http://localhost:9900 \
  -H "Content-Type: application/json" \
  -d @- << EOF
    "sender-name": "John",
    "sender-address": "[email protected]",
    "to": [
            "name": "Batman & Robin",
            "address": "[email protected]"
            "name": "Mickey + Goofey",
            "address": "[email protected]"
    "subject": "This is a marvelous email",
    "message": "This is some sample text.\r\nA new line is a good idea."

# Form request example

curl -X POST https://localhost:9900 \
   -H "Content-Type: application/x-www-form-urlencoded" \
   -d "sender-name=John Doe" \
   -d "[email protected]" \
   -d "to[0].name=Batman + Robin" \
   -d "to[0][email protected]" \
   -d "to[1].name=Mickey + Goofey" \
   -d "to[1][email protected]" \
   -d "subject=This is a marvelous email" \
   -d "message=My demo text" \
   -d "_content-type=html"

# Captcha validation

Airmail supports the validation of Google ReCaptcha (opens new window). For this to work, you need to define the environment variable AM_GRECAPTCHA_SECRET with the correct secret you got when setting up Google ReCaptcha.

Further your request needs to contain a field g-recaptcha-response holding the response you got back from Google. This is the default field name and should not be changed, as otherwise Airmail cannot validate the request properly.

Demo form

Below is a demo form showing you how to integrate Google ReCaptcha. The captcha is built into a div container - <div class="g-recaptcha" data-sitekey="<YOUR_SITE_KEY>"></div>. Set the correct site key for the data-sitekey attribute before starting.

    <meta charset="UTF-8" />
    <script src="https://www.google.com/recaptcha/api.js" async defer></script>
      <form name="demo-form" method="post" action="http://localhost:9900">
            <label for="sender-address">Sender</label>
              placeholder="Sender email"
              value="[email protected]"
            <label for="receiver-address1">Receiver</label>
              value="[email protected]"
          <input type="text" name="subject" id="subject" value="Test subject" />
          <textarea name="message" id="subject">My message...</textarea>
        <div class="g-recaptcha" data-sitekey="<YOUR_SITE_KEY>"></div>
          <button type="submit">Submit</button>

# Content type

Defining the content type of your message, aka MIME type, helps to correctly render the message content correctly, f. ex. links and formatting.

Set the _content-type parameter either to text or html.