Deep Verification · 3 credits

We send real email and watch for 72 hours

Built for maximum confidence on hard-to-verify addresses. Every other tool asks a mail server a question. Deep Verification watches what it actually does — including the delayed bounces that arrive days later.

Start free — 200 credits Compare with Quick

Cost

3 credits

per email

First results

24 hrs

partial batch

Final results

72 hrs

complete batch

The observation window

Why it takes three days

Because that is how long mail servers take to tell the truth. A verifier that answers in thirty seconds is guessing about anything that queues.

Real mail goes out

Not a lookup and not an SMTP probe — an actual blank message to every address in the batch, from our own warmed infrastructure. Your domains are never used.

0–24h

Immediate responses land

Hard bounces, rejections and mailbox-not-found replies arrive first. Most addresses resolve in this window and appear in your first results.

24–72h

Delayed bounces surface

The ones everything else misses. Many servers queue and retry for days before giving up — a tool that stops watching after 30 seconds never sees these.

72h

Final verdict written

Silence across the full window is itself evidence. Every address ends up labelled with the confidence that only observed behaviour can give.

Which one should you run

	Quick	Deep
Cost	1 credit	3 credits
Turnaround	Minutes	24–72 hours
Method	Handshake + catch-all probe	Real send, behaviour observed
Delayed bounces	Not visible	Caught
Best for	Whole lists, pipelines, CRM syncs	The stubborn remainder

Most teams run Quick across everything, then send only what comes back uncertain to Deep. That keeps the credit cost down while still resolving the addresses that matter most.

Customer stories

Hear it from the teams who run it daily

Agencies and outbound teams on what changed after they stopped throwing away catch-all and risky addresses.

LinkedHacker
John Vinton, campaign manager

The Deliverability Ninja
Deliverability consultancy

Trusted by teams worldwide

The addresses that need Deep Verification are the ones a quick check cannot answer — and for most B2B lists that is the larger half. These teams stopped guessing.