Paste an address — or a column of them — and each is read against a bundled snapshot of the same class of disposable-domain blocklist Portreeve runs in production, plus the checks a domain list alone can’t make. Everything runs in your browser. Nothing you paste leaves this page.
8,329 domains · CC0 public-domain snapshot, taken 20 Aug 2026 · no account, no network call
One address per line, up to 500. Every check runs locally — the page makes no network request with what you paste.
8,329 known disposable hosts. The community blocklist PyPI itself screens with — CC0, public domain — bundled here as a dated snapshot. The production gate’s list moves on its own schedule; this copy is from 20 Aug 2026.
Burner hosts hand out unlimited subdomains, so anything.mailinator.com reads the same as the parent. The row names the matched domain, not just a boolean.
user+trial4@ deduplicates to user@, and Gmail ignores dots. Both are noted on the row and never held against the address — a plus tag on a real mailbox is a filing habit, not a fraud signal.
support@, billing@, no-reply@ — a shared mailbox, not a person. Read as risky, never disposable: on a real gate that’s a review, not a block.
The obvious failures — no @, a bare host, an illegal label — each with its specific reason, not a shrug.
This page reads what an address is. The gate reads what it has done.
Portreeve remembers the fourteenth disposable signup from the same device — same email class, new domain every time, one device token tying the whole run together — and hardens the verdict from allow to review to block. The checker is free and stays that way. Early access is to the gate itself: the live verdict, with memory, on every signup.
no signup to use the checker · no verdict on you