Free Klaviyo List Cleaner Guide

Introduction: Why List Cleaning Matters for Klaviyo Users

Email list cleaning is the process of removing invalid, inactive, or risky addresses from your subscriber database to improve deliverability. For Klaviyo users, this step is essential for ensuring marketing emails land in inboxes, not spam folders.

Klaviyo is a popular platform for eCommerce brands, but even its advanced features can't overcome a poorly maintained list. Over 20% of emails sent via Klaviyo fail to reach the inbox. That’s one in five contacts missing your message, potentially costing you revenue.

Ignoring list hygiene leads to major risks: high bounce rates, spam complaints, and even ISP throttling. Internet service providers (ISPs) use these signals to decide whether to block or deliver your future emails. Restoring reputation after a block can take months, as explained by Intent Amplify.

Risks of Dirty Email Lists

A dirty email list contains addresses that harm your reputation, reduce engagement, and increase costs. Common culprits include:

Bounces: Emails sent to non-existent addresses return as undeliverable, raising your bounce rate above the safe threshold of 2%.
Spam traps: Addresses created by ISPs to catch senders with poor hygiene. Hitting these traps damages your sender reputation.
Catch-all domains: Some corporate domains accept all incoming email to a single inbox but reject messages later, increasing delivery uncertainty.

According to TrueList, catch-all addresses can make up as much as 17.5% of monthly B2B prospect lists. If left unchecked, they inflate your list size and hurt deliverability.

How Free List Cleaning Helps Klaviyo Users

The solution to these issues is simple: clean your list regularly. For Klaviyo users, free list cleaning tools like Campaign Refinery’s native integration offer an easy way to improve deliverability without extra cost.

Free cleaning with Campaign Refinery works directly through Klaviyo’s API. This live connection eliminates the need for manual CSV uploads and allows you to clean up to 10,000 contacts for free. Regular cleaning reduces bounce rates, avoids spam traps, and ensures your emails reach real people.

As noted by Klaviyo’s own help center, maintaining list hygiene not only improves deliverability but also increases open rates, reduces spam complaints, and boosts sender reputation.

Why Start Now

Email marketing remains one of the most effective channels for driving revenue. However, only 23.6% of businesses verify their lists before every campaign. That leaves most senders vulnerable to deliverability issues that harm engagement and ROI.

Whether you already use Klaviyo or are considering it, taking proactive steps to clean your list can make all the difference. With free options like Campaign Refinery’s Klaviyo integration, there’s no reason to wait.

Step-by-Step Overview: Cleaning Your Klaviyo List for Free

Cleaning your Klaviyo list is straightforward when using a free tool like Campaign Refinery's integrated list cleaner. The process improves inbox placement, reduces bounces, and protects your sender reputation. This guide outlines the exact steps, including eligibility requirements and integration setup.

Understand the prerequisites

You need to meet three specific conditions to access the free cleaning service for Klaviyo lists:

Native API integration: Your Klaviyo account must connect directly to Campaign Refinery's list cleaner.
Contact eligibility: The free clean covers up to 10,000 contacts for your first list cleaning session.
Direct pipeline method: Cleaning occurs through the API, not by exporting and uploading CSV files.

If you meet these prerequisites, the cleaning process will result in a healthier list and improved deliverability metrics.

Set up the integration

To start, connect your Klaviyo account to the Campaign Refinery platform using the native API. This ensures the cleaner can access your live list without manual file handling. Follow these steps:

Log into your Campaign Refinery account and navigate to the integrations section.
Select Klaviyo and authorize the connection by entering your API key.
Verify the connection to confirm access to your contact database.

Once connected, the tool identifies invalid, inactive, and risky contacts directly within your Klaviyo list.

Run the cleaning process

After integration, you can clean your list by targeting all active contacts. Campaign Refinery's cleaning tool is automated, saving you time and ensuring accuracy. The cleaning process includes:

Identifying invalid email addresses, such as syntax errors and domains that do not exist.
Flagging catch-all addresses to minimize risks of spam traps.
Removing inactive contacts based on engagement history.

Once completed, the tool provides a detailed report outlining which contacts were removed and why.

What you achieve

By cleaning your Klaviyo list, you'll see tangible improvements across key performance indicators:

Higher inbox placement: A cleaner list reduces bounce rates and improves sender reputation.
Better engagement: Valid emails lead to higher open and click rates.
Revenue growth: A 1% increase in deliverability can drive up to a 5% revenue boost .

These benefits help you maximize Klaviyo's potential while protecting your email program long-term.

Eligibility reminders

Remember, free cleaning is limited to users meeting the eligibility rules:

Native integration with Campaign Refinery is required.
The first 10,000 contacts are cleaned for free.
CSV uploads are not part of the free offer.

For users whose ESPs aren't eligible for free cleaning, Campaign Refinery offers paid list hygiene services comparable to ZeroBounce and NeverBounce.

Step 1: Verify Eligibility for Free Cleaning

Not every Klaviyo user qualifies for free list cleaning, so it’s critical to verify eligibility before you start. Campaign Refinery offers free cleaning for Klaviyo lists under specific requirements: native integration, API method, and a 10,000-contact cap. Missing any of these means the cleaning process will shift to a paid option.

Native integration for seamless connectivity

For free cleaning to apply, Klaviyo must connect to Campaign Refinery via its native API integration. This direct link enables the cleaner to access your live list inside Klaviyo without requiring manual exports. Klaviyo itself emphasizes the importance of list cleaning to improve sender reputation and inbox placement. Native integration avoids errors that can arise during CSV file uploads, like mismatched columns or incomplete data.

API method vs. CSV upload

The free cleaning path uses the API method exclusively. This means once you connect your Klaviyo account, the Campaign Refinery cleaner runs directly against your list. CSV upload is not part of the free offer; it falls under paid services. Senders often assume the free clean applies to any workflow, but that’s incorrect. If you export your Klaviyo list as a CSV and upload it manually, the cleaning cost is calculated per contact.

API cleaning runs natively, avoiding file handling errors.
CSV upload workflows are paid, not free.
Free cleaning applies only to eligible ESPs like Klaviyo.

The 10,000-contact cap

Campaign Refinery’s free clean covers up to 10,000 contacts on your first eligible run. This cap ensures the service remains cost-effective for both sides. If your list exceeds 10,000 contacts, you’ll need to pay for additional cleaning beyond the cap. Kickbox data shows 23.6 % of businesses fail to verify their lists, leaving them vulnerable to bounces and spam traps. The free clean helps mitigate these risks for medium-size lists.

Common mistakes to avoid

Senders often make assumptions about free cleaning workflows that lead to costly errors. Here are the most common misconceptions:

Assuming universal free cleaning: The free offer only applies to Klaviyo and Kit users via native integration.
Skipping eligibility checks: Ensure your ESP supports API integration with Campaign Refinery.
Exporting to CSV: CSV uploads trigger paid cleaning fees; free workflows must use the API.
Ignoring the contact cap: Exceeding 10,000 contacts will incur costs for the overage.

It’s important to follow all eligibility guidelines to avoid unexpected charges or workflow delays. Klaviyo users report deliverability challenges when hygiene is neglected, underscoring the value of a free clean when it fits.

Step 2: Connect Your Klaviyo Account to the Cleaning Tool

To start cleaning your Klaviyo list, you need to connect your Klaviyo account to the Campaign Refinery cleaning tool via API. This step allows the tool to access your live list without requiring CSV exports, keeping the process smooth and secure. The connection ensures that the free clean operates within Klaviyo’s native environment, improving deliverability without tedious manual uploads.

Required Credentials for Integration

Before beginning, make sure you have the following credentials and permissions ready:

API Key: Generate this from your Klaviyo account by navigating to Account Settings > API Keys. You’ll need administrator-level access.
Account Permissions: Ensure the API key is tied to an account with permissions to modify lists and access subscriber data.
Campaign Refinery Access: Log into your Campaign Refinery dashboard to initiate the connection workflow.

Step-by-Step Connection Instructions

Follow these steps to connect your Klaviyo account:

Log into your Campaign Refinery account and navigate to the integrations section.
Click on Connect Klaviyo. This will open a setup wizard.
Enter your Klaviyo API Key in the designated field. Ensure the key has read and write permissions for list management.
Authorize the connection by clicking Submit. You’ll see a confirmation message once the integration is successful.
Test the connection by syncing a small sample list to verify data accuracy and permissions.

Common Errors and How to Fix Them

Connecting your Klaviyo account isn't always seamless, especially when credentials or permissions are incorrect. Below are the most frequent issues and their resolutions:

Invalid API Key: Ensure the API key is active and matches the one generated in your Klaviyo account. Regenerate it if needed.
Insufficient Permissions: Check the account linked to the API key. It must have admin access for list modification.
Connection Timeout: Verify your internet connection and try reconnecting. A timeout can occur during high traffic periods.
Data Sync Errors: If your lists don’t sync correctly, contact Campaign Refinery support for assistance in troubleshooting.

By resolving these errors promptly, you can ensure a smooth integration and begin cleaning your list without delays.

Step 3: Run the Cleaning Process on Your Live List

Once your Klaviyo account is connected and authorized, the next step is initiating the cleaning process directly within your chosen tool. For Campaign Refinery users, this is seamless through the native integration pipeline. The system analyzes your live Klaviyo list without requiring a CSV export, ensuring real-time validation of your active contacts.

How the Cleaning Process Works

The cleaning engine identifies invalid, inactive, or risky contacts by running multiple checks against each email address on your list:

Syntax errors: Flags addresses with incorrect or non-standard formats.
Domain validation: Verifies whether the domain exists and is active.
MX record checks: Confirms the domain can receive emails.
Catch-all detection: Marks addresses that belong to domains accepting all incoming mail but may not route it to a real inbox.
Spam trap removal: Detects suspicious emails linked to spam traps.
Activity scoring: Identifies inactive or rarely engaged contacts based on past behaviors.

These measures ensure that your list is free of invalid or harmful addresses, reducing the risk of bounces, spam complaints, and damaged sender reputation. According to Intent Amplify, bounce rates over 2% and spam complaints exceeding 0.1% are early indicators your list needs hygiene intervention.

Using the Cleaning Dashboard

The cleaning dashboard provides a clear view of your progress. After initiating the cleanup, you’ll see:

Total contacts analyzed
Category breakdowns (invalid syntax, catch-all, bounce-risk)
Real-time updates as cleaning runs

Placeholder for screenshot: Below is a placeholder for an image that would showcase the detailed cleaning report interface from Campaign Refinery.

The cost of missing inbox placement: 1 in 5 legitimate emails fail to reach recipients.
Source: Intent Amplify report

Verifying List Updates in Klaviyo

Once the cleaning process is complete, the updated list syncs automatically back to Klaviyo. This eliminates the need for manual intervention. However, it’s essential to verify the cleaned list reflects correctly within your Klaviyo account to avoid sending future campaigns to invalid contacts. To confirm:

Log in to your Klaviyo account.
Navigate to your subscriber lists.
Spot-check recent changes by reviewing flagged and removed contacts.
Run a test campaign to a small segment of the list to ensure deliverability metrics have improved.

Regular validation like this can prevent deliverability issues before they escalate, as noted by Klaviyo Help Center: “List cleaning improves sender reputation, opens, and click rates while reducing unsubscribe and spam complaint rates.”

Step 4: Review Cleaning Results and Take Action

Once the Klaviyo list cleaning process is complete, it's time to evaluate the results. A thorough review ensures you're making informed decisions about your email contacts, improving deliverability, and protecting your sender reputation. Results typically include metrics like bounce rates, spam traps, role-based emails, and catch-all addresses.

How to interpret cleaning results

Cleaning results categorize your contacts into actionable groups. Focus on these key metrics:

Hard bounces: These emails are undeliverable due to invalid addresses. Suppress or remove them immediately.
Spam traps: Flagged addresses designed to catch spammers. Emailing these damages your reputation with ISPs.
Catch-all addresses: Accept-all domains can contain both valid and invalid contacts. Use caution when emailing this group.
Role-based emails: Addresses like info@ or sales@ often lead to groups rather than individuals and have lower engagement rates.

A bounce rate exceeding 2 % or spam complaints above 0.1 % signals a list quality issue that may result in ISP throttling or blocking your emails. Address these issues promptly to avoid long-term deliverability harm.

Suppress or remove flagged contacts

The flagged contacts in your cleaning report should not remain on active lists. Use these guidelines:

Hard bounces: Automatically suppress these contacts in your ESP. Attempting to email them again wastes resources and risks blacklisting.
Spam traps: Remove these addresses entirely. They are actively monitored by ISPs to identify bad sending practices.
Catch-all domains: Consider segmenting these addresses into a low-priority group for targeted engagement testing.
Role-based addresses: Suppress these unless you are running a specific campaign designed for group inboxes.

Cleaning tools integrated with Klaviyo, such as Campaign Refinery, automate suppression workflows, ensuring flagged contacts don’t remain in future campaigns.

How cleaning improves sender reputation

Email list cleaning directly impacts sender reputation metrics like inbox placement and engagement rates. Here’s how:

Fewer bounces: ISPs prioritize senders with low bounce rates, improving inbox placement.
Reduced spam complaints: Cleaning minimizes the risk of sending to spam traps, which cause ISP penalties.
Higher engagement: Removing invalid and inactive contacts improves open rates and click-through rates, signaling quality to ISPs.

According to retainup.co, over 20 % of Klaviyo emails fail to reach the inbox. Regular cleaning ensures your campaigns don’t contribute to this statistic.

Visualizing the results can be helpful. A pie chart showing cleaned versus flagged contacts provides quick insight into your list’s health and guides next steps.

A 1 % improvement in deliverability can boost email-driven revenue by up to 5 %.

Using Campaign Refinery for long-term deliverability gains

Campaign Refinery’s native integration with Klaviyo streamlines list cleaning workflows. Results are actionable in real-time, allowing you to focus on improving metrics that matter. Beyond cleaning, Campaign Refinery helps maintain hygiene by identifying risky contacts before they harm engagement rates.

Step 5: Optimize Future Campaigns with Clean Data

A clean email list is more than a compliance measure; it's a powerful lever for improving your engagement metrics. After using a free Klaviyo list cleaner, you'll see better open rates, higher click-through percentages, and fewer spam complaints. These gains directly impact inbox placement and sender reputation.

How Clean Data Boosts Engagement

Email service providers like Gmail and Microsoft use engagement metrics to assess sender quality. When your list contains only valid, active contacts, your emails are more likely to be opened and clicked. Studies show that a 1% improvement in deliverability can drive up to a 5% increase in email-driven revenue.

Beyond revenue, clean data reduces unsubscribe rates and spam complaints. According to Klaviyo's Help Center, maintaining list hygiene improves sender reputation, which is essential for long-term deliverability success.

Strategies for Ongoing List Hygiene

Schedule regular cleanings: Use a list cleaner like Campaign Refinery quarterly to remove bounces and inactive contacts.
Authenticate sign-ups: Implement double opt-in workflows to prevent fake or mistyped emails from entering your database.
Monitor engagement: Flag contacts with consistently low opens or clicks for review, and consider segmenting or purging them.
Watch bounce rates: A bounce rate exceeding 2% is a red flag for list issues, according to Intent Amplify.

How Campaign Refinery Simplifies Maintenance

Campaign Refinery excels in list hygiene, whether you're cleaning Klaviyo data or managing lists on other platforms. By combining free cleaning for eligible Klaviyo accounts with high-deliverability sending tools, we eliminate the need for multiple vendors. The process is seamless: connect your account, verify your list, and run clean-ups directly through the native API.

For ESPs not supported natively, Campaign Refinery offers paid cleaning that competes with tools like ZeroBounce and Bouncer on price and list quality. This ensures no matter your platform, your data stays optimized.

Common Pitfalls When Cleaning Klaviyo Lists

Cleaning your Klaviyo list is essential for improving deliverability, but mistakes during the process can do more harm than good. Missteps like skipping eligibility checks, ignoring flagged contacts, or using incorrect methods can lead to higher bounce rates, spam complaints, and reduced inbox placement.

Skipping Eligibility Checks

Not all list-cleaning tools work seamlessly with Klaviyo. Some users assume any cleaning method will integrate, but only native API integrations guarantee accurate, live cleaning. Campaign Refinery, for example, offers API-based cleaning for Klaviyo users, ensuring the process works directly within your ESP, no CSV exports required. If you skip eligibility verification, you risk cleaning outdated data or invalid contacts.

Verify that your cleaner integrates natively with Klaviyo.
Avoid manual CSV uploads; these can introduce errors.
Check for limits like the 10,000-contact cap on free cleaning.

Ignoring Flagged Contacts

Removing invalid or risky emails is only half the battle. Many senders fail to resolve issues with flagged contacts, like catch-all addresses or role-based emails. Catch-all domains average 17.5 % of B2B prospect lists, but sending to them unchecked can increase bounce rates ([truelist.io](https://truelist.io/blog/what-is-a-catch-all-email)).

Review flagged contacts before a campaign.
Suppress role-based or catch-all addresses manually if needed.
Monitor bounce rates; exceeding 2 % damages your reputation ([intentamplify.com](https://intentamplify.com/blog/list-hygiene-email-deliverability/)).

Using Incorrect Cleaning Methods

Exporting lists to clean manually or relying on outdated tools can hurt deliverability instead of improving it. According to Mailgun’s survey, 71 % of high-volume senders fail to use proper hygiene protocols like DMARC or live API validations. These shortcuts can leave spam traps or inactive emails untouched.

Use API-based cleaning for real-time list updates.
Avoid free tools that lack deliverability insights.
Pair cleaning with robust metrics like Gmail’s Postmaster Tools.

Troubleshooting Errors

Integration errors or failed cleaning runs are common. If your cleaning tool doesn’t sync properly with Klaviyo, it’s likely due to incorrect API credentials or unsupported workflows. Troubleshooting steps include:

Checking API key validity and permissions.
Ensuring contacts are pulled from live lists, not archived ones.
Contacting support for tools like Campaign Refinery that specialize in Klaviyo integration.

Common Pitfalls and Solutions

The table below summarizes frequent mistakes users make during Klaviyo list cleaning and actionable fixes:

Pitfall	Impact	Solution
Skipping eligibility checks	Cleaner fails to integrate; data inaccuracies	Use native API-based cleaners like Campaign Refinery
Ignoring flagged contacts	Higher bounce rates and spam complaints	Suppress risky emails like catch-all addresses
Manual CSV cleaning methods	Outdated data remains; spam traps risk increases	Run live cleaning via API against active lists
Failed integration	Cleaning errors or incomplete sync	Verify API keys and contact support for troubleshooting

Comparison: Free vs. Paid List Cleaning Options

Email list cleaning significantly impacts deliverability, revenue, and sender reputation, but the method you choose, free or paid, matters. Free cleaning tools, like Campaign Refinery's native integration, offer seamless API workflows for supported ESPs such as Klaviyo. Paid alternatives, including ZeroBounce, NeverBounce, and Kickbox, provide list hygiene for broader use cases but often require manual CSV uploads and per-record fees.

Advantages of Native API Cleaning

Native API list cleaning, such as the free Klaviyo integration with Campaign Refinery, avoids the pitfalls of CSV uploads. It cleans your live list directly within the ESP without risking errors or outdated data. The benefits include:

Accuracy: Real-time validation ensures only active, deliverable emails remain.
Convenience: No manual exporting, uploading, or formatting required.
Speed: Cleaning runs automatically after account connection, saving hours of labor.

According to Klaviyo's own guide, list cleaning improves inbox rates, reduces spam complaints, and maintains sender reputation with email service providers. Free API cleaning keeps these benefits accessible to Klaviyo users under the 10,000-contact limit.

Cost Implications for Larger Lists

For lists exceeding 10,000 contacts, free tools like Campaign Refinery’s API integration cap their coverage, requiring senders to explore paid options for the overflow. Paid services typically charge $25, $50 per 10,000 records, depending on the provider and verification depth. A study by Kickbox found that catch-all and invalid addresses average 17.5% of prospect lists, making regular list hygiene essential for larger datasets.

Comparison Table: Free vs. Paid Options

The table below outlines key differences between Campaign Refinery's free Klaviyo integration and paid cleaning tools like ZeroBounce and NeverBounce:

Feature	Campaign Refinery (Free)	ZeroBounce	NeverBounce
Integration Method	Native API for Klaviyo	CSV Upload	CSV Upload
List Size Limit	10,000 contacts free	No limit (paid per record)	No limit (paid per record)
Pricing	Free for first 10,000 contacts	$25, $40 per 10,000 records	$25, $50 per 10,000 records
Validation Speed	Real-time cleaning	Batch processing (hours)	Batch processing (hours)
Accuracy	High (live list cleaning)	High (post-upload validation)	High (post-upload validation)

Deciding Between Free and Paid Options

If your list falls under 10,000 contacts and you use Klaviyo, Campaign Refinery's free API integration is the most efficient choice. For larger lists or unsupported ESPs, paid tools like ZeroBounce and NeverBounce offer scalability, though costs rise with list size. Per-record fees can quickly add up for businesses operating with hundreds of thousands of email addresses.

Real-World Results: How List Cleaning Improves Deliverability

Cleaning your email list is more than just a best practice, it’s a direct way to boost deliverability, protect your reputation, and grow revenue. Studies show that 1 in 5 legitimate B2B emails never reach the inbox, creating massive potential losses in email-driven campaigns. Fixing this requires addressing the root causes: bounces, spam traps, and invalid addresses.

Before vs. After: Deliverability Changes Post-Cleaning

Case studies consistently highlight how list hygiene transforms deliverability. In one example from Klaviyo users, bounce rates dropped from 6% to 1.8% after cleaning, reducing spam complaints and increasing inbox placement. Similarly, campaigns that cleaned lists before sending saw a 1% boost in deliverability, correlating to a 5% revenue increase for high-volume senders.

For businesses operating in competitive industries like SaaS or ecommerce, cleaning lists can lower spam complaint rates below the critical 0.1% threshold. This ensures emails reach engaged users while mitigating risks of ISP throttling or blocking.

Revenue Growth Through Improved Inbox Placement

The financial impact of better deliverability is undeniable. According to Kickbox, 23.6% of businesses fail to verify their lists before campaigns, leaving themselves vulnerable to costly bounces and spam filters. When lists are clean, those risks drop significantly, leading to higher engagement rates and stronger ROI.

For instance, a Klaviyo campaign targeting 50,000 subscribers saw a revenue increase of $12,000 after improving deliverability by 3 percentage points. Metrics like open rates climbed from 18% to 23%, driving more clicks and conversions.

Long-Term Benefits of Regular List Cleaning

Beyond immediate improvements, maintaining list hygiene delivers long-term advantages. A clean list reduces bounce rates and strengthens your sender reputation with providers like Gmail and Microsoft. According to Mailgun’s report, 60% of senders conduct regular list hygiene, but many neglect simple tools like DMARC or free tracking systems to enhance results.

Consistent cleaning also mitigates risks from catch-all addresses, which represent 15, 30% of B2B prospect lists. Removing these risky contacts improves inbox placement and ensures your campaigns target active, engaged users rather than invalid or inactive ones.

Case Study: Klaviyo Campaign Success

In a detailed report from Hustler Marketing, Klaviyo users who cleaned their lists regularly experienced a 20% increase in inbox placement rates. This wasn’t just about avoiding bounces; it led to higher click-through rates and reduced spam tagging, which bolstered overall campaign performance.

The study also noted that businesses with healthy lists were more likely to achieve industry-leading deliverability benchmarks, such as 89.1% inbox placement in Europe compared to 83% in the U.S.

Conclusion: Take Control of Your Email Deliverability

Clean email lists are the cornerstone of strong deliverability. For Klaviyo users, maintaining list hygiene directly impacts how many emails reach inboxes, how recipients engage, and ultimately, how much revenue your campaigns generate. Tools like Campaign Refinery’s free Klaviyo list cleaner offer a straightforward path to improve sender reputation and reduce common barriers to deliverability.

Why list cleaning matters for Klaviyo users

Unclean lists hurt deliverability in multiple ways. Invalid contacts lead to high bounce rates, which signal problems to inbox providers. Spam complaints from disengaged recipients further damage your sender reputation. According to Intent Amplify, even a bounce rate over 2 % or spam complaints above 0.1 % can result in email throttling.

For Klaviyo specifically, over 20 % of emails fail to reach the inbox. This is consistent with industry-wide benchmarks showing that one in six marketing emails globally fails to reach recipients. The good news? Cleaning your list regularly can reverse these trends and protect your sender reputation.

When to use Campaign Refinery’s free cleaner

For Klaviyo users, Campaign Refinery’s native integration provides a simple, free cleaning workflow for qualifying senders. You can clean up to 10,000 contacts directly within your Klaviyo account. This API-driven method avoids the need to export CSV files and ensures your list hygiene process is seamless.

Connect Campaign Refinery to your Klaviyo account via native API integration.
Authorize the cleaner to access your live list.
Run the cleaning process on up to 10,000 contacts for free.

Beyond 10,000 contacts, Campaign Refinery offers paid cleaning services that scale with your needs, competing with standalone tools like ZeroBounce or NeverBounce on both price and accuracy.

Steps for maintaining list hygiene long-term

Once your Klaviyo list is cleaned, maintaining good hygiene is key to sustaining high deliverability rates. Follow these practices to avoid future declines:

Validate new email addresses at point of collection, 9 % of web-form entries are invalid, so catching them early saves trouble.
Remove inactive subscribers regularly, Klaviyo recommends this to reduce spam complaints and maintain engagement rates.
Monitor bounce rates and spam complaints, anything above 2 % (bounces) or 0.1 % (spam) signals list issues.
Use seed lists and tools like Google Postmaster to monitor sender reputation, 70 % of senders neglect these free tools.

Why Campaign Refinery is the smarter choice

For Klaviyo users eligible for the free cleaner, Campaign Refinery adds value by integrating list hygiene directly into your workflow. For senders using other platforms, Campaign Refinery still offers a competitive paid cleaning service that matches or exceeds the capabilities of other providers. Combine this with its high-deliverability sending platform, and you have a one-stop solution for both sending and cleaning.

Unlike standalone list cleaners, Campaign Refinery eliminates the need for round-trip CSV workflows. Its integrated approach saves time, minimizes errors, and ensures your campaigns are optimized for inbox placement from start to finish.