Email verification for cold-email operators

    OS Tools · Email verification for cold email

    Up to 40% of your list is already dead.

    Upload a CSV. We verify every email, rescue the risky ones and hand back an inbox-ready list in minutes. You only pay for answers we're sure of.

    Get started — pay as you goSee how it works

    No subscription · Credits never expire · Uncertain results refunded

    Encrypted in transit and at rest. Never shared or sold. Deleted automatically after 30 days. GDPR & DPA

    Test an email, freeNo account needed
    61%safe to send
    24%invalid
    15%risky, role or disposable

    A real 5,000-email cold list, before cleaning.

    How it works

    Three steps. No setup.

    leads.csv
    10,000 rows
    01

    Upload your CSV

    Drag in up to 10,000 rows. No integrations, no API keys, no Zapier.

    dpatel@vesper-analytics.io
    RiskySafe
    02

    We verify, then rescue the risky ones

    Every email gets a first-pass check. Catch-alls and risky addresses get a deeper second pass with Verify+ for a definitive safe-or-invalid verdict.

    8,213 ready
    inbox-ready.csv
    03

    Download an inbox-ready list

    Results in minutes. Export the clean list and send.

    Upload your first list free
    The toolkit

    Four tools. One credit system.

    Each tool prices in credits. Costs shown on every card.

    Email Verifier

    Most used

    Know an email is real before you send it. Bulk-verify your whole list.

    sarah.linden@northpeakcoffee.comValid
    dpatel@vesper-analytics.ioRisky
    jennyk@oldmill-graphics.netInvalid
    1 credit / email

    Verify+ · Premium Catch-All Rescue

    10 credits / email

    A deeper second pass that turns catch-alls and unknowns into a clear safe-or-invalid answer.

    Instead of throwing away 20-30% of your valid leads because they're marked catch-all, Verify+ safely recovers them. Rescuing 100 high-value leads costs less than buying 5 new ones.

    Niche Website Analyzer

    2 credits / site

    Upload a list of sites. Get back only the ones that match your target industry.

    Website Owner Finder

    Coming soon

    Find the founder or decision-maker behind any site: name, title, and contact.

    3 credits / site

    1 credit = 1 email verified.

    Free tools, no signup
    Email syntax checkerMX lookupDNS health checkDMARC & SPF checkerEmail extractorDisposable email check
    The Confidence Guarantee

    You only pay for answers we're sure of.

    Most tools charge you whether the result is useful or not. If we can't return a confident answer, the credit goes straight back to your balance. You never have to ask.

    Uncertain resultcredit refunded
    Pricing

    Pay once. Credits don't expire.

    1 credit verifies 1 email. The bigger the pack, the less each email costs. No subscription.

    5,000 credits
    $15
    $0.003 / credit · save 25%
    Get 5k credits
    10,000 credits
    $25
    $0.0025 / credit · save 37.5%
    Get 10k credits
    Most popular
    25,000 credits
    $50
    $0.002 / credit · save 50%
    Get 25k credits
    100,000 credits
    $140
    $0.0014 / credit · save 65%
    Get 100k credits

    Savings vs the $4 / 1,000-credit starter pack ($0.004 per credit). Starter pack available inside your account.

    Encrypted in transit and at rest. Never shared or sold. Deleted automatically after 30 days. GDPR & DPA

    FAQ

    Questions,
    answered.

    We run a deeper second pass (Verify+) to settle them as safe or invalid. A catch-all we can't make safe is still a real answer, so it costs a credit. Don't send to it. A genuinely uncertain result is refunded.

    See how much of your list is dead.

    No subscription. No card on file. Credits from $4 — you only pay for what you run.

    Get started — pay as you go

    Run a real list today. Pay only for confident results.

    Encrypted in transit and at rest. Never shared or sold. Deleted automatically after 30 days. GDPR & DPA