Zoho Campaigns
Zoho Campaigns Email API

Resource-oriented JSON REST API for sending email at volume from Zoho Campaigns. Covers transmissions (create, schedule, reschedule, cancel, fetch), stored HTML/text templates, recipient lists, the suppression list, sending and bounce domains, tracking domains, webhook subscriptions, delivery and event reports (open, click, bounce, spam), user management and license details. Version 2 authenticates with an API key sent as "Authorization: Zoho-zapikey"; the still-published version 1 uses the same resource tree with Zoho OAuth 2.0 tokens.
Documentation GitHub
Documentation

📖
Documentation
https://www.zoho.com/campaigns/help/emailapi/overview.html
📖
Authentication
https://www.zoho.com/campaigns/help/emailapi/authentication.html
Other Resources

🔗
PostmanCollection
https://raw.githubusercontent.com/api-evangelist/zoho-campaigns/refs/heads/main/postman/zoho-campaigns-email-api-collection.json
🔗
Webhooks
https://raw.githubusercontent.com/api-evangelist/zoho-campaigns/refs/heads/main/asyncapi/zoho-campaigns-email-api-webhooks.yml
🔗
ErrorCatalog
https://www.zoho.com/campaigns/help/emailapi/error-codes.html
Postman Collection

{
	"info": {
		"_postman_id": "512695aa-9b55-4e6c-9300-417cc90bb43b",
		"name": "Email API collection",
		"schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json",
		"_exporter_id": "37198385",
		"_collection_link": "https://www.postman.com/zoho-emailapi-b1/zoho-campaigns-email-api/collection/lhb7bxz/email-api-collection?action=share&source=collection_link&creator=37198385"
	},
	"item": [
		{
			"name": "v1 - OAuth",
			"item": [
				{
					"name": "Transmission",
					"item": [
						{
							"name": "Send Email",
							"item": [
								{
									"name": "A simple request",
									"request": {
										"method": "POST",
										"header": [
											{
												"key": "Content-Type",
												"value": "application/json"
											}
										],
										"body": {
											"mode": "raw",
											"raw": "{\n    \"transmission_name\": \"My first Email API Campaign\",\n    \"recipients\": [\n        {\n            \"address\": \"john.doe@zylker.com\",\n            \"name\": \"John Doe\",\n            \"additional_data\": {\n                \"country\": \"JP\",\n                \"ph\": \"1239333320\"\n            },\n            \"merge_data\": {\n                \"first_name\": \"John\"\n            }\n        },\n    ],\n    \"content\": {\n        \"from\": {\n            \"address\": \"aron.ea@zylker.com\",\n            \"name\": \"Aaron\"\n        },\n        \"subject\": \"Hello $[first_name|Customer]$\",\n        \"html\": \"<html><body>Welcome $[first_name|Customer]$, your content goes here</body></html>\",\n    }\n}",
											"options": {
												"raw": {
													"language": "json"
												}
											}
										},
										"url": {
											"raw": "https://{{zoho-campaigns-domain-x}}/emailapi/v1/transmission",
											"protocol": "https",
											"host": [
												"{{zoho-campaigns-domain-x}}"
											],
											"path": [
												"emailapi",
												"v1",
												"transmission"
											]
										}
									},
									"response": [
										{
											"name": "A simple request",
											"originalRequest": {
												"method": "POST",
												"header": [
													{
														"key": "Content-Type",
														"value": "application/json"
													}
												],
												"body": {
													"mode": "raw",
													"raw": "{\n    \"transmission_name\": \"My first Email API Campaign\",\n    \"recipients\": [\n        {\n            \"address\": \"john.doe@zylker.com\",\n            \"name\": \"John Doe\",\n            \"additional_data\": {\n                \"country\": \"JP\",\n                \"ph\": \"1239333320\"\n            },\n            \"merge_data\": {\n                \"first_name\": \"John\"\n            }\n        },\n    ],\n    \"content\": {\n        \"from\": {\n            \"address\": \"aron.ea@zylker.com\",\n            \"name\": \"Aaron\"\n        },\n        \"subject\": \"Hello $[first_name|Customer]$\",\n        \"html\": \"<html><body>Welcome $[first_name|Customer]$, your content goes here</body></html>\",\n    }\n}",
													"options": {
														"raw": {
															"language": "json"
														}
													}
												},
												"url": {
													"raw": "https://campaigns.zoho.com/emailapi/v1/transmission",
													"protocol": "https",
													"host": [
														"campaigns",
														"zoho",
														"com"
													],
													"path": [
														"emailapi",
														"v1",
														"transmission"
													]
												}
											},
											"status": "OK",
											"code": 200,
											"_postman_previewlanguage": "json",
											"header": [
												{
													"key": "Server",
													"value": "ZGS"
												},
												{
													"key": "Date",
													"value": "Tue, 16 Jul 2024 06:44:59 GMT"
												},
												{
													"key": "Content-Type",
													"value": "application/json"
												},
												{
													"key": "Content-Length",
													"value": "170"
												},
												{
													"key": "Connection",
													"value": "keep-alive"
												},
												{
													"key": "X-Content-Type-Options",
													"value": "nosniff"
												},
												{
													"key": "Cache-Control",
													"value": "private,no-cache,no-store,max-age=0,must-revalidate"
												},
												{
													"key": "Pragma",
													"value": "no-cache"
												},
												{
													"key": "Expires",
													"value": "Thu, 01 Jan 1970 00:00:00 GMT"
												},
												{
													"key": "X-Frame-Options",
													"value": "SAMEORIGIN"
												},
												{
													"key": "Strict-Transport-Security",
													"value": "max-age=63072000"
												}
											],
											"cookie": [],
											"body": "{\n    \"rejected_recipients\": 0,\n    \"accepted_recipients\": 1,\n    \"response\": {\n        \"code\": 200001,\n        \"message\": \"Your transmission has been scheduled successfully\"\n    },\n    \"transmission_id\": \"1093639000422588002\"\n}"
										}
									]
								},
								{
									"name": "With Template ID",
									"request": {
										"method": "POST",
										"header": [
											{
												"key": "Content-Type",
												"value": "application/json"
											}
										],
										"body": {
											"mode": "raw",
											"raw": "{\n    \"transmission_name\": \"My first Email API Campaign\",\n    \"recipients\": [\n        {\n            \"address\": \"john.doe@zylker.com\",\n            \"name\": \"John Doe\",\n            \"additional_data\": {\n                \"country\": \"JP\",\n                \"ph\": \"1239333320\"\n            },\n            \"merge_data\": {\n                \"first_name\": \"John\"\n            }\n        },\n    ],\n    \"content\": {\n        \"from\": {\n            \"address\": \"aron.ea@zylker.com\",\n            \"name\": \"Aaron\"\n        },\n        \"subject\": \"Hello $[first_name|Customer]$\",\n        \"template_id\": \"1093639000412559078\"\n    }\n}",
											"options": {
												"raw": {
													"language": "json"
												}
											}
										},
										"url": {
											"raw": "https://{{zoho-campaigns-domain-x}}/emailapi/v1/transmission",
											"protocol": "https",
											"host": [
												"{{zoho-campaigns-domain-x}}"
											],
											"path": [
												"emailapi",
												"v1",
												"transmission"
											]
										}
									},
									"response": [
										{
											"name": "With Template ID",
											"originalRequest": {
												"method": "POST",
												"header": [
													{
														"key": "Content-Type",
														"value": "application/json"
													}
												],
												"body": {
													"mode": "raw",
													"raw": "{\n    \"transmission_name\": \"My first Email API Campaign\",\n    \"recipients\": [\n        {\n            \"address\": \"john.doe@zylker.com\",\n            \"name\": \"John Doe\",\n            \"additional_data\": {\n                \"country\": \"JP\",\n                \"ph\": \"1239333320\"\n            },\n            \"merge_data\": {\n                \"first_name\": \"John\"\n            }\n        },\n    ],\n    \"content\": {\n        \"from\": {\n            \"address\": \"aron.ea@zylker.com\",\n            \"name\": \"Aaron\"\n            \n        },\n        \"subject\": \"Hello $[first_name|Customer]$\",\n        \"template_id\": \"1093639000412559078\"\n    }\n}",
													"options": {
														"raw": {
															"language": "json"
														}
													}
												},
												"url": {
													"raw": "https://campaigns.zoho.com/emailapi/v1/transmission",
													"protocol": "https",
													"host": [
														"campaigns",
														"zoho",
														"com"
													],
													"path": [
														"emailapi",
														"v1",
														"transmission"
													]
												}
											},
											"status": "OK",
											"code": 200,
											"_postman_previewlanguage": "json",
											"header": [
												{
													"key": "Server",
													"value": "ZGS"
												},
												{
													"key": "Date",
													"value": "Tue, 16 Jul 2024 06:57:22 GMT"
												},
												{
													"key": "Content-Type",
													"value": "application/json"
												},
												{
													"key": "Content-Length",
													"value": "170"
												},
												{
													"key": "Connection",
													"value": "keep-alive"
												},
												{
													"key": "X-Content-Type-Options",
													"value": "nosniff"
												},
												{
													"key": "Cache-Control",
													"value": "private,no-cache,no-store,max-age=0,must-revalidate"
												},
												{
													"key": "Pragma",
													"value": "no-cache"
												},
												{
													"key": "Expires",
													"value": "Thu, 01 Jan 1970 00:00:00 GMT"
												},
												{
													"key": "X-Frame-Options",
													"value": "SAMEORIGIN"
												},
												{
													"key": "Strict-Transport-Security",
													"value": "max-age=63072000"
												}
											],
											"cookie": [],
											"body": "{\n    \"rejected_recipients\": 0,\n    \"accepted_recipients\": 1,\n    \"response\": {\n        \"code\": 200001,\n        \"message\": \"Your transmission has been scheduled successfully\"\n    },\n    \"transmission_id\": \"1093639000422588055\"\n}"
										}
									]
								},
								{
									"name": "With Recipient list ID",
									"request": {
										"method": "POST",
										"header": [
											{
												"key": "Content-Type",
												"value": "application/json"
											}
										],
										"body": {
											"mode": "raw",
											"raw": "{\n    \"transmission_name\": \"ea_test_1\",\n    \"recipient_list_id\": \"1093639000000046001\",\n    \"content\": {\n        \"from\": {\n            \"address\": \"aron.ea@zylker.com\",\n            \"name\": \"Aaron\"\n        },\n        \"subject\": \"EA test 1\",\n        \"html\": \"<html><body>Welcome $[first_name|Customer]$, your content here $[first_name|Customer]$</body></html>\",\n    }\n}",
											"options": {
												"raw": {
													"language": "json"
												}
											}
										},
										"url": {
											"raw": "https://{{zoho-campaigns-domain-x}}/emailapi/v1/transmission",
											"protocol": "https",
											"host": [
												"{{zoho-campaigns-domain-x}}"
											],
											"path": [
												"emailapi",
												"v1",
												"transmission"
											]
										}
									},
									"response": [
										{
											"name": "With Recipient list ID",
											"originalRequest": {
												"method": "POST",
												"header": [
													{
														"key": "Content-Type",
														"value": "application/json"
													}
												],
												"body": {
													"mode": "raw",
													"raw": "{\n    \"campaign_name\": \"ea_test_1\",\n    \"recipient_list_id\": \"1093639000000046001\",\n    \"content\": {\n        \"from\": {\n            \"address\": \"aron.ea@zylker.com\",\n            \"name\": \"Aaron\"\n        },\n        \"subject\": \"EA test 1\",\n        \"html\": \"<html><body>Welcome $[first_name|Customer]$, your content here $[first_name|Customer]$</body></html>\",\n    }\n}",
													"options": {
														"raw": {
															"language": "json"
														}
													}
												},
												"url": {
													"raw": "https://campaigns.zoho.com/emailapi/v1/transmission",
													"protocol": "https",
													"host": [
														"campaigns",
														"zoho",
														"com"
													],
													"path": [
														"emailapi",
														"v1",
														"transmission"
													]
												}
											},
											"status": "OK",
											"code": 200,
											"_postman_previewlanguage": "json",
											"header": [
												{
													"key": "Server",
													"value": "ZGS"
												},
												{
													"key": "Date",
													"value": "Tue, 16 Jul 2024 06:55:28 GMT"
												},
												{
													"key": "Content-Type",
													"value": "application/json"
												},
												{
													"key": "Content-Length",
													"value": "170"
												},
												{
													"key": "Connection",
													"value": "keep-alive"
												},
												{
													"key": "X-Content-Type-Options",
													"value": "nosniff"
												},
												{
													"key": "Cache-Control",
													"value": "private,no-cache,no-store,max-age=0,must-revalidate"
												},
												{
													"key": "Pragma",
													"value": "no-cache"
												},
												{
													"key": "Expires",
													"value": "Thu, 01 Jan 1970 00:00:00 GMT"
												},
												{
													"key": "X-Frame-Options",
													"value": "SAMEORIGIN"
												},
												{
													"key": "Strict-Transport-Security",
													"value": "max-age=63072000"
												}
											],
											"cookie": [],
											"body": "{\n    \"rejected_recipients\": 0,\n    \"accepted_recipients\": 5,\n    \"response\": {\n        \"code\": 200001,\n        \"message\": \"Your transmission has been scheduled successfully\"\n    },\n    \"transmission_id\": \"1093639000422588023\"\n}"
										}
									]
								},
								{
									"name": "With schedule option",
									"request": {
										"method": "POST",
										"header": [
											{
												"key": "Content-Type",
												"value": "application/json"
											}
										],
										"body": {
											"mode": "raw",
											"raw": "{\n    \"transmission_name\": \"My first Email API Campaign\",\n    \"recipients\": [\n        {\n            \"address\": \"john.doe@zylker.com\",\n            \"name\": \"John Doe\",\n            \"additional_data\": {\n                \"country\": \"JP\",\n                \"ph\": \"1239333320\"\n            },\n            \"merge_data\": {\n                \"first_name\": \"John\"\n            }\n        }\n    ],\n    \"options\": {\n        \"schedule_at\": 1728474636000\n    },\n    \"content\": {\n        \"from\": {\n            \"address\": \"aron.ea@zylker.com\",\n            \"name\": \"Aaron\"\n        },\n        \"subject\": \"Hello $[first_name|Customer]$\",\n        \"html\": \"<html><body>Welcome $[first_name|Customer]$, your content goes here</body></html>\",\n    }\n}",
											"options": {
												"raw": {
													"language": "json"
												}
											}
										},
										"url": {
											"raw": "https://{{zoho-campaigns-domain-x}}/emailapi/v1/transmission",
											"protocol": "https",
											"host": [
												"{{zoho-campaigns-domain-x}}"
											],
											"path": [
												"emailapi",
												"v1",
												"transmission"
											]
										}
									},
									"response": [
										{
											"name": "With schedule option",
											"originalRequest": {
												"method": "POST",
												"header": [
													{
														"key": "Content-Type",
														"value": "application/json"
													}
												],
												"body": {
													"mode": "raw",
													"raw": "{\n    \"transmission_name\": \"My first Email API Campaign\",\n    \"recipients\": [\n        {\n            \"address\": \"john.doe@zylker.com\",\n            \"name\": \"John Doe\",\n            \"additional_data\": {\n                \"country\": \"JP\",\n                \"ph\": \"1239333320\"\n            },\n            \"merge_data\": {\n                \"first_name\": \"John\"\n            }\n        }\n    ],\n    \"options\": {\n        \"schedule_at\": 1728474636000\n    },\n    \"content\": {\n        \"from\": {\n            \"address\": \"aron.ea@zylker.com\",\n            \"name\": \"Aaron\"\n        },\n        \"subject\": \"Hello $[first_name|Customer]$\",\n        \"html\": \"<html><body>Welcome $[first_name|Customer]$, your content goes here</body></html>\",\n    }\n}",
													"options": {
														"raw": {
															"language": "json"
														}
													}
												},
												"url": {
													"raw": "https://campaigns.zoho.com/emailapi/v1/transmission",
													"protocol": "https",
													"host": [
														"campaigns",
														"zoho",
														"com"
													],
													"path": [
														"emailapi",
														"v1",
														"transmission"
													]
												}
											},
											"status": "OK",
											"code": 200,
											"_postman_previewlanguage": "json",
											"header": [
												{
													"key": "Server",
													"value": "ZGS"
												},
												{
													"key": "Date",
													"value": "Tue, 16 Jul 2024 06:55:28 GMT"
												},
												{
													"key": "Content-Type",
													"value": "application/json"
												},
												{
													"key": "Content-Length",
													"value": "170"
												},
												{
													"key": "Connection",
													"value": "keep-alive"
												},
												{
													"key": "X-Content-Type-Options",
													"value": "nosniff"
												},
												{
													"key": "Cache-Control",
													"value": "private,no-cache,no-store,max-age=0,must-revalidate"
												},
												{
													"key": "Pragma",
													"value": "no-cache"
												},
												{
													"key": "Expires",
													"value": "Thu, 01 Jan 1970 00:00:00 GMT"
												},
												{
													"key": "X-Frame-Options",
													"value": "SAMEORIGIN"
												},
												{
													"key": "Strict-Transport-Security",
													"value": "max-age=63072000"
												}
											],
											"cookie": [],
											"body": "{\n    \"rejected_recipients\": 0,\n    \"accepted_recipients\": 1,\n    \"response\": {\n        \"code\": 200001,\n        \"message\": \"Your transmission has been scheduled successfully\"\n    },\n    \"transmission_id\": \"1093639000422588023\"\n}"
										}
									]
								},
								{
									"name": "With tracking disabled",
									"request": {
										"method": "POST",
										"header": [
											{
												"key": "Content-Type",
												"value": "application/json"
											}
										],
										"body": {
											"mode": "raw",
											"raw": "{\n    \"transmission_name\": \"My first Email API Campaign\",\n    \"recipients\": [\n        {\n            \"address\": \"john.doe@zylker.com\",\n            \"name\": \"John Doe\",\n            \"additional_data\": {\n                \"country\": \"JP\",\n                \"ph\": \"1239333320\"\n            },\n            \"merge_data\": {\n                \"first_name\": \"John\"\n            }\n        }\n    ],\n    \"options\": {\n        \"tracking\": \"disabled\"\n    },\n    \"content\": {\n        \"from\": {\n            \"address\": \"aron.ea@zylker.com\",\n            \"name\": \"Aaron\"\n        },\n        \"subject\": \"Hello $[first_name|Customer]$\",\n        \"html\": \"<html><body>Welcome $[first_name|Customer]$, your content goes here</body></html>\",\n    }\n}",
											"options": {
												"raw": {
													"language": "json"
												}
											}
										},
										"url": {
											"raw": "https://{{zoho-campaigns-domain-x}}/emailapi/v1/transmission",
											"protocol": "https",
											"host": [
												"{{zoho-campaigns-domain-x}}"
											],
											"path": [
												"emailapi",
												"v1",
												"transmission"
											]
										}
									},
									"response": [
										{
											"name": "With tracking disabled",
											"originalRequest": {
												"method": "POST",
												"header": [
													{
														"key": "Content-Type",
														"value": "application/json"
													}
												],
												"body": {
													"mode": "raw",
													"raw": "{\n    \"transmission_name\": \"My first Email API Campaign\",\n    \"recipients\": [\n        {\n            \"address\": \"john.doe@zylker.com\",\n            \"name\": \"John Doe\",\n            \"additional_data\": {\n                \"country\": \"JP\",\n                \"ph\": \"1239333320\"\n            },\n            \"merge_data\": {\n                \"first_name\": \"John\"\n            }\n        }\n    ],\n    \"options\": {\n        \"open_tracking\": \"disabled\",\n        \"click_tracking\": \"disabled\"\n    },\n    \"content\": {\n        \"from\": {\n            \"address\": \"aron.ea@zylker.com\",\n            \"name\": \"Aaron\"\n        },\n        \"subject\": \"Hello $[first_name|Customer]$\",\n        \"html\": \"<html><body>Welcome $[first_name|Customer]$, your content goes here</body></html>\",\n    }\n}",
													"options": {
														"raw": {
															"language": "json"
														}
													}
												},
												"url": {
													"raw": "https://campaigns.zoho.com/emailapi/v1/transmission",
													"protocol": "https",
													"host": [
														"campaigns",
														"zoho",
														"com"
													],
													"path": [
														"emailapi",
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													]
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											},
											"status": "OK",
											"code": 200,
											"_postman_previewlanguage": "json",
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												{
													"key": "Server",
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									"name": "With unsubscribe link",
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										"method": "POST",
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												"key": "Content-Type",
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											"name": "With unsubscribe link",
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														"raw": {
															"language": "json"
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												"url": {
													"raw": "https://campaigns.zoho.com/emailapi/v1/transmission",
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													"host": [
														"campaigns",
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													"path": [
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											"status": "OK",
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							"name": "Get transmission details",
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									"name": "Get transmission details",
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										"method": "GET",
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											"raw": "https://{{zoho-campaigns-domain-x}}/emailapi/v1/transmission/1093639000422588023",
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									"name": "Reschedule transmission",
									"request": {
										"method": "PUT",
										"header": [
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												"key": "Content-Type",
												"value": "application/json"
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# --- truncated at 32 KB (404 KB total) ---
# Full source: https://raw.githubusercontent.com/api-evangelist/zoho-campaigns/refs/heads/main/postman/zoho-campaigns-email-api-collection.json