Clean Outreach Lists & Protect Your Sender Reputation
Cold lists decay — people change jobs, mailboxes disappear, domains lapse. MailRook Email Validation re-checks every address in real time: mailbox existence, dead domains, disposable providers, catch-alls, and enterprise gateways. Send to real inboxes, keep bounces low.
Check a prospect — see deliverability and gateway in one go.
Checking syntax, MX, SMTP, trust, gateway, and domain profile…
A prospect list goes stale the moment you stop using it. Sending to addresses that no longer exist spikes your bounce rate, drags down your sender reputation, and lands your real prospects in spam.
People switch jobs and companies retire mailboxes — work emails go dead faster than any other type.
High bounce rates tell mailbox providers your data is bad — future sends get throttled or spam-foldered.
Catch-all domains accept anything, so a "valid" result can still bounce. You need to know which is which.
Prospects behind Proofpoint or Mimecast scrutinise cold mail aggressively — blind sending wastes the touch.
MailRook Email Validation runs each address through the full stack of checks that decide whether a cold email lands — and returns a clear verdict for every one.
Direct SMTP verification confirms the mailbox still accepts mail — the headline deliverability fact for any cold send.
Drops addresses on domains that no longer exist or have no MX records — a fast, hard fail before you waste a send.
Strips throwaway and temporary addresses — including new burner domains hiding on shared disposable infrastructure.
Flags accept-all domains where a positive result can't be trusted, so you can decide how much risk to take.
Identifies generic mailboxes (info@, sales@, support@) that aren't a real person — so you target decision-makers.
Detects enterprise SEGs and returns a protection level — see secure email gateway detection.
A deliverable address can still be a hard target. Prospects behind Proofpoint, Mimecast, or Barracuda scan cold mail aggressively. MailRook Email Validation tells you the protection level of every address, so you can segment your sequences instead of burning reputation on blind sends.
Standard spam filters only — your best, highest-priority cold-outreach targets.
Strict authentication enforced — make sure your own SPF/DKIM/DMARC is clean before sending.
Dedicated SEG detected — throttle volume, lose link-heavy templates, and personalise hard.
Check a single address inline or run your whole prospect list through the API or dashboard.
Remove non-existent mailboxes, dead domains, disposables, and risky catch-alls from the send.
Route unprotected leads into high-volume sequences and gateway-protected ones into personalised outreach.
Spend touches on prospects that actually exist — and protect the team's sending domain.
Keep client domains healthy across many campaigns by verifying every list before launch.
Confirm target-account contacts are live and identify which sit behind enterprise gateways.
Run lean outbound without torching your domain reputation on a stale prospect list.
100 free checks per day, no credit card required. Upgrade when your volume grows.
Perfect for developers and small teams getting started with email validation.
10,000 credits — use at your own pace. No subscription, no expiration.
For businesses and teams that need high-volume validation or dedicated infrastructure.
Verify your outreach list before the next send. 100 free checks per day, no credit card required.