← All Newsletter & ESP Workflows
BillionVerifyHighlevel
Automate client renewal alerts from GoHighLevel to Gmail, Slack & Google Sheets
Pull contacts, verify each address with BillionVerify, and continue to HighLevel — only deliverable addresses get through.
Why verify before the send
Sending to invalid, risky, catch-all, or disposable addresses spikes your bounce rate and erodes sender reputation. A verification gate before the HighLevel step removes that risk automatically — only deliverable addresses continue, the rest are flagged.
The workflow
BillionVerify — verification sits right before the send.
Node by node
- 1Schedule Daily at 9 AMTrigger· n8n
Starts the workflow — on a schedule, a webhook, or manually while you test.
- 2Fetch Contacts from GoHighLevelSource· n8n
Provides or transforms the contact data flowing through the workflow.
- 3Check Has Custom FieldsLogic· n8n
Branches on the verification result: only deliverable addresses continue to the send; the rest are skipped and flagged.
- 4Filter Renewals CodeSource· n8n
Provides or transforms the contact data flowing through the workflow.
- 5Verify Expiring Within 10 DaysLogic· n8n
Routes items based on the workflow logic.
- 6Verify Email (BillionVerify)Verify· billionverify
The BillionVerify node verifies the address — status (valid / invalid / risky / catch-all / role / disposable), is_deliverable, and a confidence score — before anything is sent.
- 7Send Slack Alert to TeamSource· n8n
Provides or transforms the contact data flowing through the workflow.
- 8IF deliverableLogic· n8n
Branches on the verification result: only deliverable addresses continue to the send; the rest are skipped and flagged.
- 9Merge Email and Slack ResultsSource· n8n
Provides or transforms the contact data flowing through the workflow.
- 10Send Renewal Email via GmailSend· n8n
Sends only to verified, deliverable addresses. Swap in your own provider node if you send elsewhere.
- 11Generate Summary ReportSource· n8n
Provides or transforms the contact data flowing through the workflow.
- 12Log Results to Google SheetsSource· n8n
Provides or transforms the contact data flowing through the workflow.
Workflow JSON
Copy or download this workflow, then import it in n8n (Workflows → Import from File / Paste). Install the BillionVerify community node first, then add your API key credential.
verify-emails-in-highlevel.json
{
"name": "Automate client renewal alerts from GoHighLevel to Gmail, Slack & Google Sheets + BillionVerify",
"nodes": [
{
"id": "e89a6dcb-42d4-4674-bd3d-2f91b86231b2",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-3120,
-64
],
"parameters": {
"color": 4,
"width": 420,
"height": 656,
"content": "## 🔄 Client Retention Renewal Reminder Workflow\n\nAutomatically identifies clients with contracts expiring within 10 days and sends personalized renewal reminders.\n\n### What This Workflow Does:\n- **Runs daily at 9 AM** to check for expiring contracts\n- **Fetches all contacts** from GoHighLevel CRM\n- **Filters clients** whose contracts expire in 0-10 days\n- **Sends renewal emails** to clients via Gmail\n- **Notifies account managers** via Slack\n- **Logs all activities** to Google Sheets for tracking\n\n### Business Benefits:\n- ✅ Never miss a renewal opportunity\n- ✅ Improve client retention rates\n- ✅ Automate manual follow-up tasks\n- ✅ Track renewal campaign effectiveness\n\n### Requirements:\n- GoHighLevel account with custom fields:\n - Contract End Date field\n - Account Manager field\n- Gmail account for sending emails\n- Slack workspace for notifications\n- Google Sheets for logging"
},
"typeVersion": 1
},
{
"id": "9ffba3e1-2389-47df-8257-708871c6c5e4",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"position": [
-2656,
-208
],
"parameters": {
"color": 5,
"width": 280,
"height": 240,
"content": "## ⏰ Schedule Trigger Setup\n\nRuns daily at 9:00 AM server time.\n\n**Configuration:**\n- Cron: `0 9 * * *`\n- Frequency: Every day\n- Time: 9:00 AM\n\n**Why 9 AM?**\nEarly morning execution ensures:\n- Emails arrive during business hours\n- Account managers have full day to respond\n- Prevents weekend/holiday issues"
},
"typeVersion": 1
},
{
"id": "94e0e170-fe29-42a6-9926-d052fbc28fd5",
"name": "Schedule Daily at 9 AM",
"type": "n8n-nodes-base.scheduleTrigger",
"position": [
-2560,
48
],
"parameters": {
"rule": {
"interval": [
{
"field": "cronExpression",
"expression": "0 9 * * *"
}
]
}
},
"typeVersion": 1.1
},
{
"id": "05b63bb3-1942-4f24-9d53-3b3f2a25a7f5",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
-2432,
240
],
"parameters": {
"color": 5,
"width": 280,
"height": 396,
"content": "## 📥 Fetch Contacts from CRM\n\n**Setup Instructions:**\n1. Connect your GoHighLevel account\n2. Set limit to 50 (or adjust based on needs)\n3. Ensure API permissions include contact read access\n\n**Required Custom Fields:**\n- Contract End Date (Date field)\n- Account Manager (Text field)\n\n**Note:** Increase limit if you have more than 50 active clients"
},
"typeVersion": 1
},
{
"id": "5e3e0e62-267e-4728-a4ae-f92581607f06",
"name": "Fetch Contacts from GoHighLevel",
"type": "n8n-nodes-base.highLevel",
"position": [
-2336,
48
],
"parameters": {
"filters": {},
"options": {},
"operation": "getAll",
"requestOptions": {}
},
"credentials": {
"highLevelOAuth2Api": {
"id": "credential-id",
"name": "highLevelOAuth2Api Credential"
}
},
"typeVersion": 2
},
{
"id": "9e665b65-003d-430d-a7f7-48228b7dcad8",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
-2208,
-272
],
"parameters": {
"color": 5,
"width": 260,
"height": 292,
"content": "## 🔍 Validate Data Quality\n\nEnsures contacts have custom fields before processing.\n\n**Why This Matters:**\n- Prevents errors in downstream nodes\n- Filters out incomplete contact records\n- Improves workflow reliability"
},
"typeVersion": 1
},
{
"id": "eb37756d-3de4-4d63-8215-b4e8520bcb5e",
"name": "Check Has Custom Fields",
"type": "n8n-nodes-base.if",
"position": [
-2112,
48
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "58341a8d-2417-47e1-b29b-be575b270c35",
"operator": {
"type": "array",
"operation": "notEmpty",
"singleValue": true
},
"leftValue": "={{ $json.customFields }}",
"rightValue": ""
}
]
}
},
"typeVersion": 2.2
},
{
"id": "f102174e-cba7-4d13-a322-f2327d9f1449",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1936,
208
],
"parameters": {
"color": 5,
"width": 280,
"height": 404,
"content": "## 🎯 Filter Expiring Contracts\n\n**Logic:**\n- Finds Contract End Date field\n- Calculates days until expiry\n- Filters: 0-10 days remaining\n\n**Customization:**\nChange `daysUntilExpiry <= 10` to adjust reminder window:\n- 7 days = 1 week notice\n- 14 days = 2 weeks notice\n- 30 days = 1 month notice\n\n**Important:** Update field IDs to match YOUR GoHighLevel custom fields"
},
"typeVersion": 1
},
{
"id": "6f9a5a69-8ce9-46c1-88f2-d12a44a3f319",
"name": "Filter Renewals Code",
"type": "n8n-nodes-base.code",
"position": [
-1888,
48
],
"parameters": {
"jsCode": "// Get current date at midnight for accurate day comparison\nconst today = new Date();\ntoday.setHours(0, 0, 0, 0);\n\n// Array to store filtered contacts\nconst filteredContacts = [];\n\n// Process each contact from input\nfor (const contact of $input.all()) {\n const item = contact.json;\n \n // Check if contact has customFields\n if (!item.customFields || !Array.isArray(item.customFields)) {\n continue;\n }\n \n // TODO: Replace with YOUR custom field ID for Contract End Date\n const contractEndField = item.customFields.find(\n field => field.id === 'YOUR_CONTRACT_END_DATE_FIELD_ID'\n );\n \n // Skip if no contract end date exists\n if (!contractEndField || !contractEndField.value) {\n continue;\n }\n \n // Parse contract end date (timestamp in milliseconds)\n const contractEndDate = new Date(contractEndField.value);\n contractEndDate.setHours(0, 0, 0, 0);\n \n // Calculate days until expiry\n const daysUntilExpiry = Math.ceil(\n (contractEndDate - today) / (1000 * 60 * 60 * 24)\n );\n \n // Filter: expires within next 10 days (0-10 days)\n if (daysUntilExpiry >= 0 && daysUntilExpiry <= 10) {\n \n // TODO: Replace with YOUR custom field ID for Account Manager\n const accountManagerField = item.customFields.find(\n field => field.id === 'YOUR_ACCOUNT_MANAGER_FIELD_ID'\n );\n \n // Format the contract end date for display\n const formattedDate = contractEndDate.toLocaleDateString('en-US', {\n year: 'numeric',\n month: 'long',\n day: 'numeric'\n });\n \n // Create enriched contact object\n filteredContacts.push({\n json: {\n // Original contact data\n id: item.id,\n contactName: item.contactName,\n firstName: item.firstName || 'N/A',\n lastName: item.lastName || 'N/A',\n email: item.email || 'No email on file',\n companyName: item.companyName || 'N/A',\n phone: item.phone,\n \n // Contract information\n contractEndDate: formattedDate,\n contractEndDateRaw: contractEndDate.toISOString(),\n contractEndTimestamp: contractEndField.value,\n daysUntilExpiry: daysUntilExpiry,\n \n // Account manager info\n accountManager: accountManagerField?.value || 'Unassigned',\n \n // Additional fields for workflow\n allCustomFields: item.customFields,\n tags: item.tags || [],\n source: item.source\n }\n });\n }\n}\n\n// Return filtered contacts\nreturn filteredContacts;"
},
"typeVersion": 2
},
{
"id": "6f7a46e5-115c-4bef-9cc7-e30b96b1b94d",
"name": "Verify Expiring Within 10 Days",
"type": "n8n-nodes-base.filter",
"position": [
-1664,
48
],
"parameters": {
"conditions": {
"number": [
{
"value1": "={{ $json.daysUntilExpiry }}",
"value2": 10,
"operation": "smallerEqual"
}
],
"string": [
{
"value1": "={{ $json.contractEndDate }}",
"operation": "isNotEmpty"
}
]
}
},
"typeVersion": 1
},
{
"id": "3b9392da-852b-4692-bfac-5c177bbda695",
"name": "Sticky Note5",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1536,
-400
],
"parameters": {
"color": 5,
"width": 280,
"height": 340,
"content": "## 📧 Send Client Email\n\n**Setup:**\n1. Connect Gmail account\n2. Replace recipient with: `={{ $json.email }}`\n3. Customize email template\n\n**Email Variables:**\n- `firstName` - Client first name\n- `lastName` - Client last name\n- `contractEndDate` - Formatted expiry date\n- `companyName` - Company name\n\n**Best Practice:** Test email with your own address first"
},
"typeVersion": 1
},
{
"id": "17f722d7-781c-41d4-bd15-b84b187df947",
"name": "Send Renewal Email via Gmail",
"type": "n8n-nodes-base.gmail",
"position": [
-1440,
-48
],
"webhookId": "c62251a2-e50a-4f59-8e3e-d35403ca9d82",
"parameters": {
"sendTo": "={{ $json.email }}",
"message": "=Hi {{ $json.firstName }} {{ $json.lastName }},\n\nThis is a friendly reminder that your contract with us is set to expire on {{ $json.contractEndDate }}.\n\nWe'd love to continue working with you! Please let us know if you'd like to discuss renewal options.\n\nYour account manager will be reaching out shortly.\n\nBest regards,\nYour Team",
"options": {},
"subject": "Important: Your Contract Renewal is Coming Up"
},
"typeVersion": 2.1
},
{
"id": "3e716197-e31d-49d9-8c3e-b1ba215bed06",
"name": "Sticky Note6",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1488,
304
],
"parameters": {
"color": 5,
"width": 280,
"height": 384,
"content": "## 📢 Slack Team Notification\n\n**Setup:**\n1. Connect Slack workspace\n2. Select channel for renewal alerts\n3. Customize message format\n\n**Recommended Channels:**\n- #renewals\n- #account-management\n- #sales-alerts\n\n**Note:** Ensure all account managers have access to the selected channel"
},
"typeVersion": 1
},
{
"id": "79b9f0dd-1fd1-4562-b93e-99e3bc111aeb",
"name": "Send Slack Alert to Team",
"type": "n8n-nodes-base.slack",
"position": [
-1440,
144
],
"webhookId": "2d02c3a0-61c7-4742-b2d5-665e3ad8dab8",
"parameters": {
"text": "=🔔 *Contract Renewal Alert*\n\n*Client:* {{ $json.firstName }} {{ $json.lastName }}\n*Email:* {{ $json.email }}\n*Company:* {{ $json.companyName || \"N/A\" }}\n*Contract Expires:* {{ $json.contractEndDate }}\n*Days Remaining:* {{ $json.daysUntilExpiry }}\n*Account Manager:* {{ $json.accountManager }}\n\n✅ Renewal email has been sent to client.\n📋 Please follow up within 3 business days.",
"select": "channel",
"channelId": {
"__rl": true,
"mode": "list",
"value": "YOUR_SLACK_CHANNEL_ID",
"cachedResultName": "Select your renewals channel"
},
"otherOptions": {}
},
"typeVersion": 2.1
},
{
"id": "f3448850-b573-416a-b34c-8e1e7d985151",
"name": "Merge Email and Slack Results",
"type": "n8n-nodes-base.merge",
"position": [
-1216,
48
],
"parameters": {
"mode": "combine",
"options": {},
"combinationMode": "mergeByPosition"
},
"typeVersion": 2.1
},
{
"id": "96ae9e61-3ffc-4f04-b6ac-2a58495dc455",
"name": "Sticky Note7",
"type": "n8n-nodes-base.stickyNote",
"position": [
-1072,
-272
],
"parameters": {
"color": 5,
"width": 260,
"height": 296,
"content": "## 📊 Generate Summary Report\n\nCreates execution summary with:\n- Total reminders sent\n- Timestamp of execution\n- Success status\n\n**Used for:**\n- Tracking workflow performance\n- Logging to Google Sheets\n- Debugging issues"
},
"typeVersion": 1
},
{
"id": "c61d0e08-0b24-4be6-bbcd-b58de927212a",
"name": "Generate Summary Report",
"type": "n8n-nodes-base.code",
"position": [
-992,
48
],
"parameters": {
"jsCode": "const totalReminders = $input.all().length;\nconst timestamp = new Date().toLocaleString();\n\nreturn {\n json: {\n summary: `Renewal Reminder Workflow Completed`,\n totalRemindersSent: totalReminders,\n timestamp: timestamp,\n message: `${totalReminders} renewal reminder(s) sent successfully on ${timestamp}`\n }\n};"
},
"typeVersion": 2
},
{
"id": "9e39598a-d4f0-43e9-9885-a306371772e1",
"name": "Sticky Note8",
"type": "n8n-nodes-base.stickyNote",
"position": [
-752,
256
],
"parameters": {
"color": 5,
"width": 280,
"height": 268,
"content": "## 📝 Log to Google Sheets\n\n**Setup:**\n1. Create a Google Sheet for tracking\n2. Add columns: summary, totalRemindersSent, timestamp, message\n3. Connect your Google account\n4. Select your spreadsheet and sheet\n\n"
},
"typeVersion": 1
},
{
"id": "ace3170b-c470-4458-b601-db08918f1572",
"name": "Log Results to Google Sheets",
"type": "n8n-nodes-base.googleSheets",
"position": [
-768,
48
],
"parameters": {
"columns": {
"value": {},
"schema": [
{
"id": "summary",
"type": "string",
"display": true,
"required": false,
"displayName": "summary",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "totalRemindersSent",
"type": "string",
"display": true,
"required": false,
"displayName": "totalRemindersSent",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "timestamp",
"type": "string",
"display": true,
"required": false,
"displayName": "timestamp",
"defaultMatch": false,
"canBeUsedToMatch": true
},
{
"id": "message",
"type": "string",
"display": true,
"required": false,
"displayName": "message",
"defaultMatch": false,
"canBeUsedToMatch": true
}
],
"mappingMode": "autoMapInputData",
"matchingColumns": []
},
"options": {},
"operation": "appendOrUpdate",
"sheetName": {
"__rl": true,
"mode": "list",
"value": "Sheet1",
"cachedResultName": "Select sheet name"
},
"documentId": {
"__rl": true,
"mode": "list",
"value": "YOUR_GOOGLE_SHEET_ID",
"cachedResultName": "Select your tracking sheet"
}
},
"typeVersion": 4.7
},
{
"parameters": {
"operation": "verify",
"email": "={{ $json.email }}",
"additionalOptions": {}
},
"type": "n8n-nodes-billionverify.billionVerify",
"typeVersion": 1,
"position": [
-1800,
-48
],
"name": "Verify Email (BillionVerify)",
"credentials": {
"billionVerifyApi": {
"id": "",
"name": "BillionVerify account"
}
}
},
{
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "loose"
},
"combinator": "and",
"conditions": [
{
"id": "is-deliverable",
"leftValue": "={{ $json.is_deliverable }}",
"rightValue": "",
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
}
}
]
}
},
"type": "n8n-nodes-base.if",
"typeVersion": 2,
"position": [
-1620,
-48
],
"name": "IF deliverable"
}
],
"connections": {
"Filter Renewals Code": {
"main": [
[
{
"node": "Verify Expiring Within 10 Days",
"type": "main",
"index": 0
}
]
]
},
"Schedule Daily at 9 AM": {
"main": [
[
{
"node": "Fetch Contacts from GoHighLevel",
"type": "main",
"index": 0
}
]
]
},
"Check Has Custom Fields": {
"main": [
[
{
"node": "Filter Renewals Code",
"type": "main",
"index": 0
}
]
]
},
"Generate Summary Report": {
"main": [
[
{
"node": "Log Results to Google Sheets",
"type": "main",
"index": 0
}
]
]
},
"Send Slack Alert to Team": {
"main": [
[
{
"node": "Merge Email and Slack Results",
"type": "main",
"index": 1
}
]
]
},
"Send Renewal Email via Gmail": {
"main": [
[
{
"node": "Merge Email and Slack Results",
"type": "main",
"index": 0
}
]
]
},
"Merge Email and Slack Results": {
"main": [
[
{
"node": "Generate Summary Report",
"type": "main",
"index": 0
}
]
]
},
"Verify Expiring Within 10 Days": {
"main": [
[
{
"node": "Verify Email (BillionVerify)",
"type": "main",
"index": 0
},
{
"node": "Send Slack Alert to Team",
"type": "main",
"index": 0
}
]
]
},
"Fetch Contacts from GoHighLevel": {
"main": [
[
{
"node": "Check Has Custom Fields",
"type": "main",
"index": 0
}
]
]
},
"Verify Email (BillionVerify)": {
"main": [
[
{
"node": "IF deliverable",
"type": "main",
"index": 0
}
]
]
},
"IF deliverable": {
"main": [
[
{
"node": "Send Renewal Email via Gmail",
"type": "main",
"index": 0
}
],
[]
]
}
},
"settings": {
"executionOrder": "v1"
}
}When to use this
- Cleaning a list before a HighLevel send or sync.
- Protecting HighLevel deliverability and sender reputation.
- Keeping bounce rates low so your sending is never throttled.
FAQ
Why verify before sending in HighLevel?
Verifying first keeps your bounce rate low, which protects your sender reputation and your results.
How do I import this workflow?
Download the JSON, then in n8n go to Workflows → Import from File (or paste it). Install the BillionVerify community node and add your API key credential.
What happens to risky or catch-all addresses?
They are routed to the false branch and excluded from the send. You decide whether to retry, review, or drop them.
Add verification to your workflow
Create a free account, grab your API key, and stop bounces before they happen.
Get started free