Documentation Index
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Payload Structure
When an email is delivered to your webhook endpoint, the request body contains a JSON object with the full email data.
{
"messageId": "CAOEWyCpfbcjqB-YFzTqZ7=h2g02qCq7WLWa4qZ35N7zvkxK2Mg@mail.gmail.com",
"uid": "9acc5494cd7d20629cec",
"date": "2026-04-23T19:49:41.015503484+00:00",
"subject": "Order Confirmation #1234",
"from": "[email protected]",
"to": "[email protected]",
"cc": null,
"bcc": null,
"replyTo": null,
"textBody": "Hi, I'd like to check the status of my order...\r\n",
"htmlBody": "<div dir=\"ltr\">Hi, I'd like to check the status of my order...</div>\r\n",
"attachments": [
{
"filename": "receipt.pdf",
"content_type": "application/pdf",
"size": 24531,
"content": "JVBERi0xLjQK...",
"content_id": null,
"disposition": "attachment"
}
],
"domain": "yourdomain.com",
"messageSize": 4586,
"remoteIp": "2a00:1450:4864:20::532",
"remoteHost": "mail-ed1-x532.google.com",
"headers": {
"Received-SPF": "pass (smtp.jetsmtp.net: domain of [email protected] designates sender 2a00:1450:4864:20::532)",
"MIME-Version": "1.0",
"Content-Type": "multipart/alternative; boundary=\"000000000000cdc479065025f2d8\"",
"ARC-Seal": "i=1; a=rsa-sha256; t=1776973778; cv=none; d=google.com; s=arc-20240605; b=...",
"DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=example.com; s=google; t=1776973778; ...",
"ARC-Authentication-Results": "i=1; mx.google.com; arc=none",
"ARC-Message-Signature": "i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20240605; ...",
"Authentication-Results": "smtp.jetsmtp.net; dkim=pass [email protected] header.s=google; spf=pass smtp.mailfrom=\"[email protected]\"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=example.com; arc=pass (i=1); bimi=none",
"Received": "from mail-ed1-x532.google.com (2a00:1450:4864:20::532) by smtp.jetsmtp.net with ESMTP id 9acc5494cd7d20629cec; Thu, 23 Apr 2026 19:49:43 +0000",
"Message-ID": "CAOEWyCpfbcjqB-YFzTqZ7=h2g02qCq7WLWa4qZ35N7zvkxK2Mg@mail.gmail.com"
}
}
Field Descriptions
| Field | Type | Description |
|---|
messageId | string | Value of the email Message-ID header |
uid | string | Unique internal ID for this delivery |
date | string | null | Email send date (ISO 8601), from the Date header |
subject | string | null | Email subject line |
from | string | null | Sender address(es) |
to | string | Recipient address(es), comma-separated |
cc | string | null | CC address(es), comma-separated |
bcc | string | null | BCC address(es), comma-separated |
replyTo | string | null | Reply-To header value |
textBody | string | null | Plain text body |
htmlBody | string | null | HTML body |
attachments | array | null | List of attachments (see below) |
domain | string | The receiving domain (e.g. yourdomain.com) |
messageSize | integer | Total size of the raw email in bytes |
remoteIp | string | IP address of the sending mail server |
remoteHost | string | Resolved hostname of the sending mail server |
headers | object | Filtered set of important email headers (see below) |
Attachments
Each attachment in the attachments array contains:
| Field | Type | Description |
|---|
filename | string | Attachment filename |
content_type | string | MIME type (e.g. application/pdf, image/png) |
size | integer | Size in bytes |
content | string | Base64-encoded file contents |
content_id | string | null | Content-ID for inline attachments (e.g. embedded images) |
disposition | string | attachment or inline |
Attachments are Base64-encoded and included directly in the payload. Large attachments will increase the payload size significantly. Make sure your endpoint can handle the expected payload sizes within the configured timeout.
| Header | Description |
|---|
Message-ID | Unique message identifier |
Date | Original send date |
MIME-Version | MIME version |
Content-Type | Content type and encoding |
Content-Transfer-Encoding | Transfer encoding method |
User-Agent | Sending client user agent |
X-Mailer | Sending mail client |
Authentication-Results | SPF, DKIM, and DMARC results |
Received-SPF | SPF verification result |
DKIM-Signature | DKIM signature |
ARC-Authentication-Results | ARC authentication results |
ARC-Message-Signature | ARC message signature |
ARC-Seal | ARC seal |
Received | Received header chain |
The Authentication-Results header is useful for checking whether the email passed SPF, DKIM, and DMARC checks at our servers.
