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Gumroad email verification with BillionVerify
Gumroad is an e-commerce platform for creators selling digital products, memberships, and downloads directly to their audience. Every sale captures a buyer email address. Verifying those addresses with BillionVerify keeps your customer list deliverable, your follow-up emails out of bounce traps, and your post-purchase communication reliable.
Why verify before the send
A single product launch can bring thousands of new buyer emails into your Gumroad account. Some buyers use temporary addresses to access freebies; others have stale addresses that are no longer active. Verifying emails after purchase — or before sending a marketing follow-up — reduces hard bounces, protects your ESP sender score, and ensures your audience communications actually land.
Ready-to-use n8n workflow
Import this workflow into n8n — it verifies every address with BillionVerify before Gumroad sends, so only deliverable contacts are emailed. Install the BillionVerify community node first, then add your API key. Adapted from this n8n template
verify-emails-in-gumroad.json
{
"name": "GummyMail - Next Gen Gumroad AutoReply & CRM System + BillionVerify",
"nodes": [
{
"id": "f6bbafa7-a682-4714-9bd5-ca8f5e6d20fd",
"name": "Gmail Trigger",
"type": "n8n-nodes-base.gmailTrigger",
"position": [
0,
0
],
"parameters": {
"filters": {
"q": "New sale of "
},
"pollTimes": {
"item": [
{
"mode": "everyHour"
}
]
}
},
"credentials": {
"gmailOAuth2": {
"id": "credential-id",
"name": "gmailOAuth2 Credential"
}
},
"typeVersion": 1.3
},
{
"id": "c8c48cc8-1b6a-4d53-a486-c4f30054deff",
"name": "Create a database page",
"type": "n8n-nodes-base.notion",
"position": [
1008,
-16
],
"parameters": {
"options": {},
"resource": "databasePage",
"databaseId": {
"__rl": true,
"mode": "list",
"value": "2c411b7d-dc06-80fc-87e9-db7d5c714c1e",
"cachedResultUrl": "https://www.notion.so/2c411b7ddc0680fc87e9db7d5c714c1e",
"cachedResultName": "Gumroad Leads"
},
"propertiesUi": {
"propertyValues": [
{
"key": "Name|title",
"title": "={{ $('Code in JavaScript').item.json.name }}"
},
{
"key": "email|rich_text",
"textContent": "={{ $('Code in JavaScript').item.json.email }}"
},
{
"key": "Product|rich_text",
"textContent": "={{ $('Code in JavaScript').item.json.product }}"
},
{
"key": "Purchase Date|rich_text",
"textContent": "={{ $('Code in JavaScript').item.json.purchaseDate }}"
},
{
"key": "Quantity|rich_text",
"textContent": "={{ $('Code in JavaScript').item.json.quantity }}"
},
{
"key": "UniqueKey|rich_text",
"textContent": "={{ $('Code in JavaScript').item.json.uniqueKey }}"
}
]
}
},
"credentials": {
"notionApi": {
"id": "credential-id",
"name": "notionApi Credential"
}
},
"typeVersion": 2.2
},
{
"id": "a09a6310-d570-4e65-81aa-cc7ae72996d6",
"name": "Code in JavaScript",
"type": "n8n-nodes-base.code",
"position": [
240,
0
],
"parameters": {
"jsCode": "// Robust Gumroad email parser for n8n Code node\n// Normalise whitespace so fields that are on same line still parse correctly.\nconst raw = ($json.snippet || \"\");\nconst text = raw.replace(/\\s+/g, \" \").trim() + \" \"; // collapse whitespace and add trailing space\n\nfunction find(pattern, fallback = \"\") {\n const m = text.match(pattern);\n return m ? m[1].trim() : fallback;\n}\n\n// Product: words after $price until a dash, \"View\", \"Email\", \"Quantity\", or known keyword\nlet product = find(/\\$\\d+\\s+([A-Za-z0-9][A-Za-z0-9\\s\\-\\+&]*?)(?=\\s+(?:-|View|Email|Quantity|Product|Referrer|Name|UTM|$))/i);\nif (product) product = product.replace(/\\s+(?:Order|Product price)$/i, \"\").trim();\n\n// Name: accept Customer X Email, Name X next-keyword, Buyer X, or Name at end.\n// Works for multi-word names and when name is last field.\nlet name = \"\";\nconst namePatterns = [\n /Customer\\s+(.+?)(?=\\s+(?:Email|Quantity|UTM|Referrer|Product|Name|$))/i,\n /Name\\s+(.+?)(?=\\s+(?:Product|Email|Quantity|Referrer|UTM|$))/i,\n /Buyer\\s+(.+?)(?=\\s+(?:Email|Quantity|Referrer|Product|UTM|$))/i,\n];\nfor (const p of namePatterns) {\n const m = text.match(p);\n if (m && m[1]) { name = m[1].trim(); break; }\n}\n\n// Email, Quantity, Referrer (stop at next keyword)\nconst email = find(/Email\\s+([^\\s]+)/i);\nconst quantity = find(/Quantity\\s+(\\d+)/i);\nlet referrer = find(/Referrer\\s+(.+?)(?=\\s+(?:Name|Email|Quantity|Product|UTM|$))/i);\n\n// purchaseDate from Gmail internalDate if present\nlet purchaseDate = \"\";\nif ($json.internalDate) {\n purchaseDate = new Date(Number($json.internalDate)).toISOString();\n}\n\n// unique key: fallbacks to avoid undefined\nconst uniqueKey = `${email || \"no-email\"}-${product || \"no-product\"}-${purchaseDate || \"no-date\"}`;\n\nreturn [\n {\n json: {\n product: product || \"\",\n name: name || \"\",\n email: email || \"\",\n quantity: quantity || \"\",\n referrer: referrer || \"\",\n purchaseDate,\n uniqueKey\n }\n }\n];\n"
},
"typeVersion": 2
},
{
"id": "cf3b7bec-90ec-4861-956c-cf981792bad7",
"name": "AI Agent",
"type": "@n8n/n8n-nodes-langchain.agent",
"position": [
1280,
-16
],
"parameters": {
"text": "=You are an email writing assistant. Write a short, warm, professional, and emotionally positive email to a customer who has just purchased one of my digital products on Gumroad.\n\nUse the following customer details:\n- Name: {{ $json.name }}\n- Product Purchased: {{ $json.property_product }}\n\nWrite the email as if it is coming directly from me (Paul). The tone should be:\n- friendly but professional\n- genuinely appreciative\n- concise (5–7 sentences max)\n- emotionally positive and reassuring\n- no unnecessary marketing fluff\n\nInclude:\n- a warm thank-you for their purchase from Gumroad \n- a sentence appreciating their trust \n- a brief one-line description of what the product helps with \n- reassurance that they can reach me anytime for help \n- a positive closing note wishing them success with the product \n\nDo NOT include subject lines unless I ask separately.\nReturn only the email body in clean paragraph form.",
"options": {},
"promptType": "define"
},
"typeVersion": 3
},
{
"id": "cc162afe-bcb7-472e-8bf1-f6927e3740e7",
"name": "Google Gemini Chat Model",
"type": "@n8n/n8n-nodes-langchain.lmChatGoogleGemini",
"position": [
1280,
256
],
"parameters": {
"options": {}
},
"credentials": {
"googlePalmApi": {
"id": "credential-id",
"name": "googlePalmApi Credential"
}
},
"typeVersion": 1
},
{
"id": "8e9de348-c81b-4719-a4c7-f357638f5599",
"name": "Send a message",
"type": "n8n-nodes-base.gmail",
"position": [
1648,
-16
],
"webhookId": "093a6f85-cd54-496a-a355-cdb71b92d908",
"parameters": {
"sendTo": "={{ $('Code in JavaScript').item.json.email }}",
"message": "={{ $json.output }}",
"options": {
"appendAttribution": false
},
"subject": "Thank you for supporting my work ❤️",
"emailType": "text"
},
"credentials": {
"gmailOAuth2": {
"id": "credential-id",
"name": "gmailOAuth2 Credential"
}
},
"typeVersion": 2.1
},
{
"id": "b6afd0bb-e744-49e1-abbb-06018be0d6e1",
"name": "If",
"type": "n8n-nodes-base.if",
"position": [
688,
0
],
"parameters": {
"options": {},
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "41dd1ae9-c8bb-4e72-9148-3702cb72297f",
"operator": {
"type": "number",
"operation": "equals"
},
"leftValue": "={{ Object.keys($json).length }}",
"rightValue": 0
}
]
}
},
"typeVersion": 2.2
},
{
"id": "e49a189b-319f-4d44-afc4-1a4e346ca01a",
"name": "Stop and Error",
"type": "n8n-nodes-base.stopAndError",
"notes": "Error when duplictes is detected.",
"position": [
880,
240
],
"parameters": {
"errorMessage": "The Data already exsists"
},
"notesInFlow": true,
"typeVersion": 1
},
{
"id": "cbfb4691-8738-4fc7-b1c4-6d8359fdb6ce",
"name": "Get many database pages",
"type": "n8n-nodes-base.notion",
"position": [
464,
0
],
"parameters": {
"simple": false,
"filters": {
"conditions": [
{
"key": "UniqueKey|rich_text",
"condition": "equals",
"richTextValue": "={{ $json.uniqueKey }}"
}
]
},
"options": {},
"resource": "databasePage",
"operation": "getAll",
"databaseId": {
"__rl": true,
"mode": "list",
"value": "2c411b7d-dc06-80fc-87e9-db7d5c714c1e",
"cachedResultUrl": "https://www.notion.so/2c411b7ddc0680fc87e9db7d5c714c1e",
"cachedResultName": "Gumroad Leads"
},
"filterType": "manual"
},
"credentials": {
"notionApi": {
"id": "credential-id",
"name": "notionApi Credential"
}
},
"notesInFlow": false,
"typeVersion": 2.2,
"alwaysOutputData": true
},
{
"id": "f07a92a1-f032-490d-be55-19b6fadb4bdd",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"position": [
-64,
-336
],
"parameters": {
"color": 7,
"width": 432,
"height": 512,
"content": "## Request Authentication\nListens for Gumroad purchase emails and extracts buyer and product information.\n\n### Action Required\nAuthenticate Gmail\nEnsure Gumroad purchase emails are received in this inbox"
},
"typeVersion": 1
},
{
"id": "59bc2cc5-a46e-481c-9130-08624ef95410",
"name": "Sticky Note2",
"type": "n8n-nodes-base.stickyNote",
"position": [
400,
-336
],
"parameters": {
"color": 7,
"width": 432,
"height": 512,
"content": "## Customer Lookup\n\nChecks the Notion database for existing customers and stops execution if a duplicate is found.\n\n## Action Required\n- Connect your Notion account\n- Select the correct customer database\n"
},
"typeVersion": 1
},
{
"id": "9d46503d-783a-4359-ad67-130673589713",
"name": "Sticky Note3",
"type": "n8n-nodes-base.stickyNote",
"position": [
1248,
-336
],
"parameters": {
"color": 7,
"width": 544,
"height": 512,
"content": "## AI Reply & Delivery\nGenerates a personalized thank-you email using AI and sends it to the buyer automatically.\n\n### Outcome\n- Instant post-purchase engagement\n- Professional buyer experience\n- Fully automated workflow completion"
},
"typeVersion": 1
},
{
"id": "1639dd58-ddcd-4734-b0da-86a92104b461",
"name": "Sticky Note4",
"type": "n8n-nodes-base.stickyNote",
"position": [
880,
-336
],
"parameters": {
"color": 7,
"width": 288,
"height": 512,
"content": "## Create Customer Record\n\nCreates a new customer record in Notion for first-time buyers.\n\n### What it stores:\n- Buyer details\n- Product purchased\n- Purchase value\n- Timestamp"
},
"typeVersion": 1
},
{
"id": "b1493b9a-309f-4859-94cb-48c50b970f42",
"name": "Sticky Note7",
"type": "n8n-nodes-base.stickyNote",
"position": [
-912,
-240
],
"parameters": {
"width": 576,
"height": 320,
"content": "# Mirai MailFlow\nThis workflow automates post-purchase communication for Gumroad creators.\n\nWhen a Gumroad purchase email arrives in Gmail, the workflow extracts buyer and product details, checks for duplicate customers, stores the purchase in Notion, and sends a personalized thank-you email using AI.\n\nSetup requires connecting Gmail, Notion, and an AI model.\nWorks on cloud and self-hosted n8n. Setup takes ~5–10 minutes."
},
"typeVersion": 1
},
{
"parameters": {
"operation": "verify",
"email": "={{ $('Code in JavaScript').item.json.email }}",
"additionalOptions": {}
},
"type": "n8n-nodes-billionverify.billionVerify",
"typeVersion": 1,
"position": [
1288,
-16
],
"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": [
1468,
-16
],
"name": "IF deliverable"
}
],
"connections": {
"If": {
"main": [
[
{
"node": "Create a database page",
"type": "main",
"index": 0
}
],
[
{
"node": "Stop and Error",
"type": "main",
"index": 0
}
]
]
},
"AI Agent": {
"main": [
[
{
"node": "Verify Email (BillionVerify)",
"type": "main",
"index": 0
}
]
]
},
"Gmail Trigger": {
"main": [
[
{
"node": "Code in JavaScript",
"type": "main",
"index": 0
}
]
]
},
"Send a message": {
"main": [
[]
]
},
"Code in JavaScript": {
"main": [
[
{
"node": "Get many database pages",
"type": "main",
"index": 0
}
]
]
},
"Create a database page": {
"main": [
[
{
"node": "AI Agent",
"type": "main",
"index": 0
}
]
]
},
"Get many database pages": {
"main": [
[
{
"node": "If",
"type": "main",
"index": 0
}
]
]
},
"Google Gemini Chat Model": {
"ai_languageModel": [
[
{
"node": "AI Agent",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Verify Email (BillionVerify)": {
"main": [
[
{
"node": "IF deliverable",
"type": "main",
"index": 0
}
]
]
},
"IF deliverable": {
"main": [
[
{
"node": "Send a message",
"type": "main",
"index": 0
}
],
[]
]
}
},
"settings": {
"executionOrder": "v1"
}
}Workflow templates with Gumroad
Ready-to-use workflows that verify emails before Gumroad sends.
How it works
- 1
A buyer completes a purchase on Gumroad, triggering a sale event with their email address.
- 2
An n8n workflow (BillionVerify community node) or an Integrately automation picks up the new sale event.
- 3
BillionVerify verifies the buyer's email — checking syntax, DNS, SMTP reachability, and disposable provider status.
- 4
Valid addresses are added to your mailing list or CRM; invalid or disposable ones are flagged or excluded.
- 5
Your follow-up emails, receipts, and future promotions reach real, active inboxes.
When to use this
Verify buyer emails at the moment of purchase
When a new Gumroad sale is recorded, send the buyer's email to BillionVerify before adding it to your mailing list or CRM. Disposable and invalid addresses are caught immediately, keeping your subscriber base clean from day one.
Audit your existing Gumroad customer list
Before a major promotion or newsletter send, run your full Gumroad customer export through BillionVerify's bulk verification. Remove addresses that have become invalid over time to protect deliverability during high-stakes campaigns.
Filter free-download buyers from engaged subscribers
People who grab free products often use throwaway addresses. BillionVerify's disposable detection lets you separate high-risk addresses from your paid customer list so you can segment and target more effectively.
FAQ
Should I verify every Gumroad buyer email, including paid customers?
Yes. Even paid buyers occasionally use non-primary email addresses that bounce. Verifying at purchase time catches these immediately, so your follow-up sequences and customer communications stay healthy.
Can I verify Gumroad emails in bulk if I already have a large customer list?
Absolutely. Export your customer list from Gumroad and upload it to BillionVerify for bulk processing. Results are returned with a per-address verdict so you can clean your list before your next campaign.
What is a disposable email address and why does it matter for Gumroad sellers?
Disposable addresses are temporary inboxes that expire shortly after use. Buyers who use them to download free products can't be reached for upsells or follow-ups, and sending to them inflates your bounce metrics.
Verify emails in Gumroad
Create a free account, grab your API key, and stop bounces before they happen.
Get started free