Checked live. Never from a cache.
A stale list is a bouncing list. ListGuru re-checks every address against the receiving domain’s live mail servers at the moment you ask — and tells you which verdict it reached and why, instead of handing back an unexplained score.
Beyond valid / invalid
Verdicts you can act on
A binary answer isn't enough when plenty of business domains accept everything. ListGuru classifies each address so you know exactly what to send — and what to skip.
- →Catch-all is called out as catch-all — an address on an accept-all domain is flagged as unconfirmable rather than passed off as verified.
- →Every verdict comes with its reason — which check decided it — so you can judge a borderline address yourself.
- →Disposable, role-based and typo domains flagged before they poison your sender reputation.
Verification run — 4 of 1,200 rows
sasha.marin@orbitline.io
Mailbox confirmed
amara@nimbusforge.dev
Deliverability signals positive
hello@tempmail.example
Disposable domain
ops@meridiangrid.com
Role address on an accept-all domain
Single & bulk
Verify one email or one million
Single checks
Paste an address, get a verdict in seconds — with the full signal breakdown behind it.
Bulk CSV verification
Upload any list and get it back scored and segmented — verified, catch-all, risky, invalid.
Bounce-rate protection
Teams routinely cut bounces from 8–12% to under 2% — keeping domains out of spam folders.
Real-time API
Verify at the point of capture — signup forms, CRM imports, sequence launches.
Half-credit pricing
Every check costs just 0.5 credits — clean a 10,000-row list for 5,000 credits.
Evidence included
See the MX, SMTP and gateway signals behind every verdict — no black-box scores.
Stop guessing. Start verifying.
25 free verifications every month on the Free plan — no card required.