Zoho Mail

Access the Zoho Mail API with managed OAuth authentication. Send, receive, search, and manage emails with full folder and label management.

Quick Start

# List all accounts
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/zoho-mail/api/accounts')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Base URL

https://api.maton.ai/zoho-mail/{native-api-path}

Maton proxies requests to mail.zoho.com and automatically injects your OAuth token.

Authentication

All requests require the Maton API key in the Authorization header:

Authorization: Bearer $MATON_API_KEY

Environment Variable: Set your API key as MATON_API_KEY:

export MATON_API_KEY="YOUR_API_KEY"

Getting Your API Key

1. Sign in or create an account at maton.ai
2. Go to maton.ai/settings
3. Copy your API key

Connection Management

Manage your Zoho Mail OAuth connections at https://api.maton.ai.

List Connections

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections?app=zoho-mail&status=ACTIVE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Connection

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'app': 'zoho-mail'}).encode()
req = urllib.request.Request('https://api.maton.ai/connections', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections/{connection_id}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "connection": {
    "connection_id": "{connection_id}",
    "status": "ACTIVE",
    "creation_time": "2025-12-08T07:20:53.488460Z",
    "last_updated_time": "2026-01-31T20:03:32.593153Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "zoho-mail",
    "metadata": {}
  }
}

Open the returned url in a browser to complete OAuth authorization.

Delete Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections/{connection_id}', method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Specifying Connection

If you have multiple Zoho Mail connections, specify which one to use with the Maton-Connection header:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/zoho-mail/api/accounts')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', '{connection_id}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

If you have multiple connections, always include this header to ensure requests go to the intended account.

Security & Permissions

• Access is scoped to emails, folders, accounts, and organization settings within the connected Zoho Mail account.
• All write operations require explicit user approval. Before executing any create, update, or delete call, confirm the target resource and intended effect with the user.

API Reference

Account Operations

Get All Accounts

Retrieve all mail accounts for the authenticated user.

GET /zoho-mail/api/accounts

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/zoho-mail/api/accounts')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Account Details

GET /zoho-mail/api/accounts/{accountId}

Folder Operations

List All Folders

GET /zoho-mail/api/accounts/{accountId}/folders

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/zoho-mail/api/accounts/{accountId}/folders')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "status": {
    "code": 200,
    "description": "success"
  },
  "data": [
    {
      "folderId": "1367000000000008014",
      "folderName": "Inbox",
      "folderType": "Inbox",
      "path": "/Inbox",
      "imapAccess": true,
      "isArchived": 0,
      "URI": "https://mail.zoho.com/api/accounts/1367000000000008002/folders/1367000000000008014"
    },
    {
      "folderId": "1367000000000008016",
      "folderName": "Drafts",
      "folderType": "Drafts",
      "path": "/Drafts",
      "imapAccess": true,
      "isArchived": 0
    }
  ]
}

Create Folder

POST /zoho-mail/api/accounts/{accountId}/folders
Content-Type: application/json

{
  "folderName": "My Custom Folder"
}

Rename Folder

PUT /zoho-mail/api/accounts/{accountId}/folders/{folderId}
Content-Type: application/json

{
  "folderName": "Renamed Folder"
}

Delete Folder

DELETE /zoho-mail/api/accounts/{accountId}/folders/{folderId}

Label Operations

List Labels

GET /zoho-mail/api/accounts/{accountId}/labels

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/zoho-mail/api/accounts/{accountId}/labels')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Label

POST /zoho-mail/api/accounts/{accountId}/labels
Content-Type: application/json

{
  "labelName": "Important"
}

Update Label

PUT /zoho-mail/api/accounts/{accountId}/labels/{labelId}
Content-Type: application/json

{
  "labelName": "Updated Label"
}

Delete Label

DELETE /zoho-mail/api/accounts/{accountId}/labels/{labelId}

Email Message Operations

List Emails in Folder

GET /zoho-mail/api/accounts/{accountId}/messages/view?folderId={folderId}

Query Parameters:

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/zoho-mail/api/accounts/{accountId}/messages/view?folderId={folderId}&limit=10')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Search Emails

GET /zoho-mail/api/accounts/{accountId}/messages/search?searchKey={query}

Query Parameters:

Example:

python <<'EOF'
import urllib.request, os, json
import urllib.parse
query = urllib.parse.quote('from:sender@example.com')
req = urllib.request.Request(f'https://api.maton.ai/zoho-mail/api/accounts/{{accountId}}/messages/search?searchKey={query}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Email Content

GET /zoho-mail/api/accounts/{accountId}/folders/{folderId}/messages/{messageId}/content

Example:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/zoho-mail/api/accounts/{accountId}/folders/{folderId}/messages/{messageId}/content')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Email Headers

GET /zoho-mail/api/accounts/{accountId}/folders/{folderId}/messages/{messageId}/header

Get Email Metadata

GET /zoho-mail/api/accounts/{accountId}/folders/{folderId}/messages/{messageId}/details

Get Original Message (MIME)

GET /zoho-mail/api/accounts/{accountId}/messages/{messageId}/originalmessage

Send Email

POST /zoho-mail/api/accounts/{accountId}/messages
Content-Type: application/json

{
  "fromAddress": "sender@yourdomain.com",
  "toAddress": "recipient@example.com",
  "subject": "Email Subject",
  "content": "Email body content",
  "mailFormat": "html"
}

Request Body Fields:

Example - Send Email:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    "fromAddress": "sender@yourdomain.com",
    "toAddress": "recipient@example.com",
    "subject": "Hello from Zoho Mail API",
    "content": "<h1>Hello!</h1><p>This is a test email.</p>",
    "mailFormat": "html"
}).encode()
req = urllib.request.Request('https://api.maton.ai/zoho-mail/api/accounts/{accountId}/messages', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Scheduling Parameters (Optional):

Reply to Email

POST /zoho-mail/api/accounts/{accountId}/messages/{messageId}
Content-Type: application/json

{
  "fromAddress": "sender@yourdomain.com",
  "toAddress": "recipient@example.com",
  "subject": "Re: Original Subject",
  "content": "Reply content"
}

Save Draft

POST /zoho-mail/api/accounts/{accountId}/messages
Content-Type: application/json

{
  "fromAddress": "sender@yourdomain.com",
  "toAddress": "recipient@example.com",
  "subject": "Draft Subject",
  "content": "Draft content",
  "mode": "draft"
}

Update Message (Mark as Read/Unread, Move, Flag)

PUT /zoho-mail/api/accounts/{accountId}/updatemessage
Content-Type: application/json

{
  "messageId": ["messageId1", "messageId2"],
  "folderId": "folderId",
  "mode": "markAsRead"
}

Mode Options:

• markAsRead - Mark messages as read
• markAsUnread - Mark messages as unread
• moveMessage - Move messages (requires destfolderId)
• setFlag - Set flag (requires flagid)
• applyLabel - Apply labels (requires labelId)
• archive - Archive messages
• unArchive - Unarchive messages
• spam - Mark as spam
• notSpam - Mark as not spam

Example - Mark as Read:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    "messageId": ["1234567890123456789"],
    "folderId": "9876543210987654321",
    "mode": "markAsRead"
}).encode()
req = urllib.request.Request('https://api.maton.ai/zoho-mail/api/accounts/{accountId}/updatemessage', data=data, method='PUT')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Set Flag on Messages

Flag messages with a color/status indicator.

PUT /zoho-mail/api/accounts/{accountId}/updatemessage
Content-Type: application/json

{
  "mode": "setFlag",
  "messageId": ["messageId1", "messageId2"],
  "flagid": "important"
}

Flag ID Options:

Optional Parameters:

• threadId - Array of thread IDs (alternative to messageId)
• isFolderSpecific - Set to true if using folderId
• folderId - Folder ID (required if isFolderSpecific is true)
• isArchive - Set to true to include archived emails

Example - Flag as Important:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    "mode": "setFlag",
    "messageId": ["1234567890123456789"],
    "flagid": "important",
    "isFolderSpecific": True,
    "folderId": "9876543210987654321"
}).encode()
req = urllib.request.Request('https://api.maton.ai/zoho-mail/api/accounts/{accountId}/updatemessage', data=data, method='PUT')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Apply Label to Messages

Apply one or more labels to messages or threads.

PUT /zoho-mail/api/accounts/{accountId}/updatemessage
Content-Type: application/json

{
  "mode": "applyLabel",
  "messageId": ["messageId1"],
  "labelId": ["labelId1", "labelId2"]
}

Required Parameters:

• mode - Must be "applyLabel"
• messageId or threadId - Array of message/thread IDs
• labelId - Array of label IDs to apply

Optional Parameters:

• isFolderSpecific - Set to true if using folderId
• folderId - Folder ID (required if isFolderSpecific is true)
• isArchive - Set to true to include archived emails

Example - Apply Labels:

python <<'EOF'
import urllib.request, os, json
data = json.dumps({
    "mode": "applyLabel",
    "messageId": ["1234567890123456789"],
    "labelId": ["111222333444555666", "777888999000111222"],
    "isFolderSpecific": True,
    "folderId": "9876543210987654321"
}).encode()
req = urllib.request.Request('https://api.maton.ai/zoho-mail/api/accounts/{accountId}/updatemessage', data=data, method='PUT')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Note: Get label IDs by calling GET /zoho-mail/api/accounts/{accountId}/labels first.

Delete Email

DELETE /zoho-mail/api/accounts/{accountId}/folders/{folderId}/messages/{messageId}

Attachment Operations

Upload Attachment

POST /zoho-mail/api/accounts/{accountId}/messages/attachments
Content-Type: multipart/form-data

Get Attachment Info

GET /zoho-mail/api/accounts/{accountId}/folders/{folderId}/messages/{messageId}/attachmentinfo

Download Attachment

GET /zoho-mail/api/accounts/{accountId}/folders/{folderId}/messages/{messageId}/attachments/{attachmentId}

Pagination

Zoho Mail uses offset-based pagination:

GET /zoho-mail/api/accounts/{accountId}/messages/view?folderId={folderId}&start=0&limit=50

• start: Offset index (default: 0)
• limit: Number of records to return (default: 50)

For subsequent pages, increment start by limit:

• Page 1: start=0&limit=50
• Page 2: start=50&limit=50
• Page 3: start=100&limit=50

Code Examples

JavaScript

const response = await fetch(
  'https://api.maton.ai/zoho-mail/api/accounts',
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`
    }
  }
);
const data = await response.json();

Python

import os
import requests

response = requests.get(
    'https://api.maton.ai/zoho-mail/api/accounts',
    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'}
)
data = response.json()

Notes

• Account IDs are required for most operations - first call /api/accounts to get your account ID
• Message IDs and Folder IDs are numeric strings
• The fromAddress must be associated with the authenticated account
• Default folders include: Inbox, Drafts, Templates, Snoozed, Sent, Spam, Trash, Outbox
• Supported encodings: Big5, EUC-JP, EUC-KR, GB2312, ISO-2022-JP, ISO-8859-1, KOI8-R, Shift_JIS, US-ASCII, UTF-8, WINDOWS-1251
• Some operations (labels, folder management, sending) require additional OAuth scopes. If you receive an INVALID_OAUTHSCOPE error, contact Maton support at support@maton.ai with the specific operations/APIs you need and your use-case
• IMPORTANT: When using curl commands, use curl -g when URLs contain brackets to disable glob parsing
• IMPORTANT: When piping curl output to jq or other commands, environment variables like $MATON_API_KEY may not expand correctly in some shell environments

Error Handling

Troubleshooting: API Key Issues

1. Check that the MATON_API_KEY environment variable is set:

echo $MATON_API_KEY

1. Verify the API key is valid by listing connections:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Troubleshooting: Invalid App Name

1. Ensure your URL path starts with zoho-mail. For example:

• Correct: https://api.maton.ai/zoho-mail/api/accounts
• Incorrect: https://api.maton.ai/api/accounts

Resources

• Zoho Mail API Overview
• Zoho Mail API Index
• Email Messages API
• Getting Started with Zoho Mail API
• Maton Community
• Maton Support