Is my email list uploaded when I use this bulk checker?

No. The blocklists are downloaded to your browser and your list is processed on your own machine. Nothing is transmitted, so there is nothing for us to store, sell or leak - and no reason to limit or charge you.

Why do other bulk email tools charge per address?

Because they run SMTP mailbox verification on their servers, which costs them money per check and means your entire list passes through their infrastructure. Domain-level screening - disposable, free provider, role, syntax, duplicates - does not need any of that.

What should I do with addresses marked disposable?

For signup filtering, block confirmed disposables and ask for a different address. For existing lists, remove confirmed disposables before a campaign: they bounce or go unread and damage sender reputation. Treat single-list reported entries with more caution to avoid false positives.

Unlimited · runs in your browser · nothing uploaded

Bulk email checker

Paste up to 5,000 addresses or drop a CSV: disposable domains (against 76,811 known), free providers, role accounts, syntax errors and duplicates, then export the clean list. Your list never leaves this page.

What "clean" means here

The clean export keeps addresses that are syntactically valid, not on any disposable blocklist, and not duplicates. Free-provider and role-account addresses stay in (they are real mailboxes) but are flagged in the full report so you can segment them. This is domain-level screening: it removes the addresses that were never meant to receive your mail, without your list ever leaving your machine. For the two-tier disposable model, see the domain list page.