List hygiene
Check a list before it can bounce. Syntax, DNS and MX, an SMTP handshake, and risk signals. No message is sent.
Format, length, and reserved domains that can never accept mail.
The domain exists and publishes mail servers. A null MX is a hard bounce.
Connect, EHLO, MAIL FROM, RCPT TO, then quit. The message is never sent.
Known disposable inboxes, typos, role accounts, catch-all servers, and trap-style names.
Add at least one address.
On cloud hosts like Vercel where port 25 is blocked, Clearlist automatically switches to Port-443 HTTPS + Port-587/2525 + DNS SPF/DMARC verification. You can also connect a SOCKS5 proxy or HTTPS relay API (or set SMTP_PROXY_URL / VERIFY_API_URL in Vercel Environment Variables).
Ctrl+Enter verifies. Lists stay in this browser.
Score estimates how likely an address is to accept mail without bouncing. It is not inbox placement. Not confirmed means the mailbox could not be proven, so it was not marked as a bounce.
Verified safe-to-send addresses from all uploaded lists are merged and deduplicated here into one final download. Hard bounces, syntax errors, and disposable inboxes are removed.
Nothing in this view.