Email List Cleaner & Pre-Scrubber.
Upload your prospect list or CSV. Automatically remove duplicate contacts, filter temporary burner inboxes, flag role-based addresses, and export a clean list.
What this list cleaner removes:
Before uploading lists to cold email sending platforms, pre-cleaning prevents spam traps and domain burning:
admin@, support@, info@).Explore Other Free Diagnostics
Build syntax-valid DMARC TXT policies with DNS provider guides.
Simulate mobile inbox truncation and optimize cold email subjects.
Verify SVG Tiny-PS logos, VMC certificates, and DMARC alignment.
Detect throwaway domains and temporary MX mail infrastructure.
Email List Cleaning FAQs.
Learn how regular list scrubbing protects your sender reputation and keeps your domain out of spam traps.
Is my contact list uploaded to your servers?
No. This pre-cleaning tool runs 100% inside your browser using client-side JavaScript. Your email addresses never leave your computer, ensuring complete data security and GDPR compliance.
Why should I remove role-based accounts like info@ or support@?
Role accounts are typically shared by multiple team members who are much more likely to click "Report Spam". High complaint rates on role accounts can damage your domain reputation on Spamhaus and Google Postmaster.
What is the difference between list cleaning and email verification?
List cleaning performs syntax formatting, deduplication, and domain blacklisting. Email verification (performed by Sortwell's core engine) opens a direct SMTP handshake with the recipient mail server to confirm whether that specific inbox actually exists.
How many emails can I clean with this tool?
You can paste or upload files with up to 10,000 rows completely free in this browser tool. For deep mailbox verification across hundreds of thousands of contacts, use Sortwell Bulk Verify.
Clean your entire email list with zero bounces.
Sortwell checks addresses the way a mail server would — live SMTP handshake, syntax, MX verification, and spamtrap detection.