Verify Your Contact List Is Still Accurate
Verify Your Contact List Is Still Accurate with Cleanlist's waterfall enrichment. Upload a CSV or connect your CRM — 30 free credits to start.
Start Free — 30 CreditsThe Problem
Contact lists are the foundation of every outbound campaign, but most teams treat verification as optional — until their sender reputation takes a hit. A single campaign sent to an unverified list can push bounce rates above the 5% threshold that triggers spam filtering from Google and Microsoft, affecting not just the current campaign but every future email from your domain. The risk compounds with list age: a contact list that was 95% valid six months ago may now be 80% valid due to natural B2B data decay, job changes, and email address deactivation.
How Cleanlist Solves This
Cleanlist verifies every record in your contact list through a multi-layer validation process that goes beyond basic SMTP checks. Each contact's email is verified for deliverability, domain validity, catch-all status, disposable provider detection, and role-based address identification. Phone numbers are validated for format, carrier type, and active status. The result is a contact list segmented by verification confidence: contacts with verified email and phone (safe for all channels), contacts with email only (safe for email campaigns), contacts with phone only (safe for cold calling), and contacts with no verified channel (quarantine or re-research). This segmentation ensures your outreach tools only receive contacts that can actually be reached.
A Single Campaign with 5%+ Bounce Rate Can Damage Your Sender Reputation for 30+ Days
Google and Microsoft's email filtering algorithms track sender reputation at the domain level. When your domain sends a campaign with a bounce rate above 5%, both providers reduce your inbox placement rate — meaning your subsequent emails are more likely to land in spam or be silently dropped, even if they are sent to perfectly valid addresses. Recovery takes 30-60 days of consistent low-bounce sending to rebuild trust. For B2B companies sending to mid-size prospect lists (2,000-10,000 contacts), the math is unforgiving: a 5% bounce rate on 5,000 contacts means just 250 bounces trigger the penalty. With B2B data decaying at 2-3% per month, an unverified list older than 3 months almost certainly crosses this threshold. Cleanlist verification before every campaign is an insurance policy that costs pennies per contact but protects against weeks of degraded deliverability. Customers who implemented pre-send verification with Cleanlist report average bounce rates below 1.5%, compared to 4-8% before verification — keeping them safely below penalty thresholds.
Source: Google Postmaster Tools documentation; Microsoft SNDS; Cleanlist customer data
How It Works
Upload Your Contact List
Upload a CSV with contact records from any source. Cleanlist requires at minimum an email address or phone number to verify. Additional fields (name, company, title) are preserved but not required for verification.
Multi-Layer Email Verification
Each email address passes through 6 verification layers: syntax validation, DNS/MX record lookup, SMTP mailbox verification, catch-all domain detection, disposable email provider check, and role-based address identification (info@, sales@, support@).
Phone Number Validation
Phone numbers are checked for valid format, country code accuracy, carrier type (mobile, landline, VoIP), and line status (active, disconnected, ported). Invalid formats are auto-corrected where possible (e.g., missing country code).
Risk Scoring and Segmentation
Each contact receives a risk score (0-100) based on verification results. Contacts are automatically segmented: Green (verified email + phone), Yellow (one channel verified), Orange (catch-all or risky), Red (invalid — do not contact).
Review and Filter Results
See a dashboard summary: total records, verification rate by channel, risk distribution, and common issues. Filter and export by segment to create channel-specific lists: email-verified for campaigns, phone-verified for cold calling.
Export Verified Contact List
Download your verified contact list with verification status and risk scores appended as new columns. Export in CRM-ready format for HubSpot, Salesforce, or any outreach tool. Unverified contacts are exported separately for re-research.
Key Benefits
98% Email Accuracy
Real-time email verification catches bounces, catch-alls, and disposable addresses before they cost you.
15+ Data Providers
Waterfall enrichment across multiple providers means higher match rates than any single-source tool.
No Code Required
Upload a CSV, connect your CRM, or use the API. Works however your team prefers.
30 Free Credits
Start enriching immediately. No credit card, no sales call, no commitment.
Manual Process vs Cleanlist
| Feature | Manual | Cleanlist |
|---|---|---|
| Verification layers | 1-2 checks (syntax + basic SMTP) | 6 layers including catch-all and disposable detection |
| Catch-all handling | Marked as 'valid' (false positive) | Flagged separately with deliverability risk score |
| Phone validation included | Separate tool required | Email + phone verified in one pass |
| Risk segmentation | Binary valid/invalid | 4-tier risk scoring (Green/Yellow/Orange/Red) |
| Speed for 10,000 contacts | 1-4 hours (basic verification tool) | Under 5 minutes |
| Role-based email detection | Not typically detected | info@, sales@, support@ flagged automatically |
Frequently Asked Questions
How accurate is Cleanlist's data?
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Cleanlist achieves 98% email accuracy through real-time verification and cross-referencing across 15+ data providers. Every record is validated before delivery.
How many free credits do I get?
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Every new account starts with 30 free credits. Each credit processes one record (enrichment, verification, or lookup). No credit card required to start.
What data providers does Cleanlist use?
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Cleanlist uses waterfall enrichment across 15+ providers including major B2B data sources. The system automatically selects the best provider for each record to maximize match rates.
Can I connect my CRM?
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Yes. Cleanlist integrates with HubSpot, Salesforce, and other CRMs. Enriched data syncs back automatically. You can also upload CSV files or use the REST API.
How long does it take to verify my data?
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Most jobs complete in under 2 minutes for up to 10,000 records. Larger files are processed in batches with progress updates.
What is the difference between email verification and email validation?
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Email validation checks format and syntax (is it a properly formed email address). Email verification goes further by checking whether the mailbox actually exists and can receive messages via SMTP-level checks. Cleanlist performs both: validation catches formatting errors, and verification confirms deliverability. Additionally, Cleanlist checks for catch-all domains, disposable providers, and role-based addresses — layers that most validation-only tools skip.
How does Cleanlist handle role-based email addresses like info@ or sales@?
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Role-based addresses (info@, sales@, support@, admin@) are technically valid but often unsuitable for personalized outreach. Cleanlist flags these addresses separately so you can decide whether to include them. For cold outreach campaigns, we recommend excluding role-based addresses and using enrichment to find a personal email for the intended recipient instead.
Should I verify my contact list before every campaign?
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We recommend verifying any list that has not been checked in the last 90 days. B2B email addresses decay at approximately 2-3% per month due to job changes, company closures, and email deactivation. For high-stakes campaigns (product launches, large paid sends), verify even recently checked lists to ensure maximum deliverability. Real-time verification at point of entry is the best long-term solution.
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