uProc + Google Sheets: clean email lists, fewer bounces
Your email list looks fine… until the bounces roll in. Then deliverability drops, inbox placement gets weird, and you’re left guessing which “leads” were never real in the first place.
Email marketers feel it immediately, but agency owners cleaning client lists and growth teams running outbound sequences get hit too. This email verification automation helps you catch risky addresses before they damage your sender reputation.
You’ll set up a simple n8n workflow that verifies emails with uProc and writes clean results into Google Sheets, so your campaign list is ready when you are.
How This Automation Works
Here’s the complete workflow you’ll be setting up:
n8n Workflow Template: uProc + Google Sheets: clean email lists, fewer bounces
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Why This Matters: Email Bounces Quietly Wreck Campaigns
List hygiene is the kind of thing that only feels “optional” until it isn’t. You pull leads from a form, a partner list, a scraper, or an old CRM export. Then you blast a campaign and suddenly you’re dealing with undeliverables, soft bounces, and the awkward question of whether your domain is now flagged as low quality. Even worse, the cleanup usually happens in the least scalable way possible: someone spot-checks, someone else googles “is this email valid,” and the spreadsheet becomes a junk drawer of half-truths.
It adds up fast. Here’s where it breaks down.
- Manual checking turns into a recurring chore, and it steals time right before a launch when focus matters most.
- You end up sending to “maybe” addresses anyway, because nobody wants to be the person who deletes a lead that might be real.
- Bounces and spamtrap hits don’t just hurt one campaign; they can drag down future sends for weeks.
- Without a consistent status field in a Sheet, teammates segment differently, which means results become hard to trust.
What You’ll Build: uProc Verification Logged to Google Sheets
This workflow gives you a repeatable way to verify email addresses before they enter your “sendable” list. It starts with a manual run in n8n (great for batch cleanups or quick spot checks), generates an email record, and then sends that email to uProc for verification. uProc returns a delivery-style status (like deliverable, undeliverable, spamtrap, softbounce, and similar signals). After that, an If step checks whether the email is actually marked deliverable. From there, you can confidently label it as safe to use, or flag it as invalid so it never makes it into a campaign audience.
The workflow begins when you launch it in n8n. uProc evaluates the email and returns a status you can act on. Finally, the result can be written into Google Sheets so your team has one clean source of truth.
What You’re Building
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Expected Results
Say you’re prepping a weekly promo and you want to verify 200 new leads before they hit your sending segment. Manually, even a quick check and copy-paste into a sheet can take about 1 minute per lead, which is around 3 hours of dull work. With this workflow, you trigger the run once, let uProc return statuses, and review the “deliverable vs invalid” outcome in one place. You still spend a few minutes scanning results, but the heavy lifting is gone.
Before You Start
- n8n instance (try n8n Cloud free)
- Self-hosting option if you prefer (Hostinger works well)
- uProc for email verification statuses.
- Google Sheets to store verification results for your team.
- uProc API Key (get it from uProc’s Integration section)
Skill level: Beginner. You will connect credentials and map a couple of fields.
Want someone to build this for you? Talk to an automation expert (free 15-minute consultation).
Step by Step
Manual run to start the cleanup. You click “Execute workflow” in n8n when you’re ready to verify a batch, or when you want to test with a few sample emails.
Create the email record. The workflow generates an item that contains the email address to verify (in the template, this is a simple “Generate Email Record” step). In real life, you can replace this with whatever source you already use, like Mailchimp, Calendly, MySQL, or Typeform.
Verify via uProc. The uProc node checks the email and returns a status such as deliverable, undeliverable, spamtrap, or softbounce. That single output is what makes the rest of the workflow useful, because it turns a gut-feel decision into a consistent rule.
Decide what happens next. An If condition checks for a “deliverable” result. If it’s present, you treat the address as safe for campaigns. If it’s not, you flag it as invalid (so it can be excluded, reviewed, or quarantined).
You can easily modify where emails come from and where results go based on your needs. See the full implementation guide below for customization options.
Step-by-Step Implementation Guide
Step 1: Configure the Manual Trigger
Set up the manual trigger to start the workflow when you run it in the editor.
- Add the Manual Launch Trigger node as the workflow trigger.
- Leave the default settings in Manual Launch Trigger since it has no required parameters.
- Ensure Manual Launch Trigger connects to Generate Email Record.
Step 2: Connect Uproc API
Configure the email verification service so the workflow can check deliverability.
- Open Validate Email Presence and confirm the Tool is set to
checkEmailExists. - Set the Email field to
={{$node["Generate Email Record"].json["email"]}}. - Credential Required: Connect your uprocApi credentials in Validate Email Presence.
Step 3: Set Up Generate Email Record
Create the email value that will be validated in later steps.
- Open Generate Email Record and set Function Code to
item.email = "[YOUR_EMAIL]"; return item;. - Replace
[YOUR_EMAIL]with the email address you want to verify. - Confirm Generate Email Record connects to Validate Email Presence.
⚠️ Common Pitfall: Forgetting to replace [YOUR_EMAIL] will cause the validation to run on a placeholder value instead of your target email.
Step 4: Configure Delivery Status Check
Set the conditional logic that determines if the email is deliverable.
- Open Delivery Status Check and set the condition Value 1 to
={{$node["Validate Email Presence"].json["message"]["response"]}}. - Set Value 2 to
deliverableto match a successful response. - Ensure Validate Email Presence connects to Delivery Status Check.
Step 5: Test and Activate Your Workflow
Run a manual test to verify the email validation works before turning it on for use.
- Click Execute Workflow and confirm the test email passes through Generate Email Record and Validate Email Presence.
- Check Delivery Status Check output to ensure the condition evaluates correctly (true for
deliverable). - When results look correct, toggle the workflow to Active for production use.
Troubleshooting Tips
- uProc credentials can expire or need specific permissions. If things break, check your uProc Integration section (email + API key) first.
- If you’re cleaning large batches, you may hit rate limits or timeouts. Slow it down with Split in Batches (Loop Over Items) so uProc has time to respond consistently.
- Google Sheets failures are usually permissions or a changed spreadsheet layout. Confirm the connected Google account still has edit access and that your column names match what the workflow writes.
Quick Answers
About 20 minutes if you already have your uProc and Google accounts ready.
No. You’ll paste your uProc API key and map a few fields in n8n.
Yes. n8n has a free self-hosted option and a free trial on n8n Cloud. Cloud plans start at $20/month for higher volume. You’ll also need to factor in uProc API usage costs based on how many emails you verify.
Two options: n8n Cloud (managed, easiest setup) or self-hosting on a VPS. For self-hosting, Hostinger VPS is affordable and handles n8n well. Self-hosting gives you unlimited executions but requires basic server management.
Yes, and you probably should. Replace the “Generate Email Record” step with your real source (Mailchimp, Typeform, Calendly, MySQL, or even a Google Sheet row). Then keep the uProc verification and the “Delivery Status Check” logic the same. Common tweaks include writing results back to a “Status” column, tagging records in a CRM, or routing non-deliverable emails to a review tab.
Most of the time it’s an API key issue. Regenerate your uProc API key (from the Integration section) and update the credentials in n8n, then run a single test email to confirm. If it still fails, check that you’re sending a valid email field into the uProc node, not an empty value. High-volume runs can also trigger temporary limits, so slow the batch size if errors appear mid-run.
It depends on your n8n plan and uProc limits, but most small teams run hundreds to a few thousand checks in a day without trouble. On n8n Cloud Starter, you’re constrained by monthly executions; on self-hosted n8n, you mainly care about server resources and how fast you pace requests. If you’re processing big lists, use batching so you don’t overwhelm uProc and end up with incomplete results.
Often, yes, especially when you want control. n8n makes it easier to add branching logic (like “deliverable vs everything else”), retry behavior, and batching without turning the scenario into a pricing headache. You can also self-host, which matters if you’re cleaning lists frequently. Zapier and Make are totally fine for simple “verify then write one row” setups, though. If you’re unsure, Talk to an automation expert and describe your lead volume and tools.
A clean list is one of those boring advantages that compounds. Set this up once, run it before every campaign, and stop letting bounces dictate your results.
Need Help Setting This Up?
Our automation experts can build and customize this workflow for your specific needs. Free 15-minute consultation—no commitment required.
