How to Clean Your Email List — 5 Steps
Email lists degrade 25-30% per year. Here's exactly how to clean yours and protect your deliverability.
Why Clean Your Email List?
An unclean email list is a ticking time bomb. 25-30% of email addresses become invalid every year as people change jobs, domains expire, and accounts get abandoned. Sending to these addresses causes bounces, which damage your sender reputation and reduce deliverability for everyone on your list.
Step 1: Export Your Email List
Export your subscriber list from your ESP (Mailchimp, SendGrid, HubSpot, etc.) as a CSV file. Include the email column and any segmentation data you want to preserve.
Step 2: Run AI-Powered Verification
Upload your CSV to ZeroBounce AI. Our AI engine checks each address across multiple layers:
🤖 What AI Verification Checks
✅ Syntax validation — catches typos and formatting errors
✅ MX record check — confirms the domain can receive email
✅ SMTP verification — confirms the mailbox exists
✅ Catch-all scoring — AI confidence for accept-all domains
✅ Disposable detection — flags temporary email services
✅ Spam trap identification — protects against blacklisting
Step 3: Review Categorized Results
Results are categorized into actionable groups:
Step 4: Remove Bad Emails
Delete all invalid, disposable, and low-confidence catch-all (score below 50) addresses. Move role-based emails (info@, sales@) to a separate segment with different messaging.
Step 5: Re-Import & Set Up Ongoing Cleaning
Import your cleaned list back into your ESP. Then set up ongoing protection:
Clean Your Email List Now
Upload your list and get AI-verified results in minutes. 100 free verifications, no credit card.