how it works

FROM GRUBBY

TO GLEAMINGduck

The whole journey, start to finish. No mystery, no jargon. Just what happens to your list and why it comes back better.

total time: about 8 minutes per 100k ✦
1step one

UPLOAD ANYTHING

CSV, XLSX, a straight copy-paste, or a live API feed. Column mapping is automatic: we find the email column even in a messy export.

.csv .xlsx paste API
duck
Drop spring-newsletter.csv
77,103 rows · email column found ✓
encrypted on arrival auto-deletes in 30 days
drag, drop, done
Scrubbing spring-newsletter.csv… 04:12 elapsed
✓Syntax · 214 typos caughtdone
✓Domain · 1,032 dead domainsdone
…Mailbox · pinging live inboxesrunning
Risk · traps, blacklists, disposablesqueued
grab a coffee ✦
2step two

THE FOUR-PASS SCRUB

Every address runs the full pipeline: syntax (typos identified), domain (does it accept mail?), mailbox (is someone home?), and risk (traps, blacklists, disposables).

All at the protocol level; no email is ever sent to anyone on your list.

3step three

ANSWERS, NOT CODES

Three piles, each with a 0–10 score and the reason in plain English. Download the clean file, or sync it straight back to your ESP with the "do not send" pile suppressed automatically.

CLEAREDReal, live inboxes. Fire away.
CAUTIONDeliverable, but watch them.
DO NOT SENDGone , and good riddance.
spring-newsletter.csv scrubbed ✓
77,103 addresses · cleaned in 6m 12s
Cleared
59%
Caution
13%
Do not send
28%
⬇ Download clean list Sync to ESP →
hover for sparkles →
us vs the rest

HOW ARE WE DIFFERENT?

Cheaper cleaners check that an address exists. We check that it is safe to send to. One spam trap gets your domain blocked, and that does not cost you one campaign: it hamstrings every campaign after it until your reputation is rebuilt, and that takes months. That is what the difference in price buys.

OUR COMPETITORS
US
the validity check
Mailbox exists and the server responds
✓
✓
Domain is real
✓
✓
Disposables and catch-alls flagged
✓
✓
the threat layer
Spam traps and recycled addresses
✕
✓
Seed and monitoring addresses
✕
✓
Bot-generated signups
✕
✓
Known complainers and malicious contacts
✕
✓
A threat level on every address
✕
✓
HOW CLEAN IT COMES BACK · THEM
Bounces gone. Traps, seeds and bots still in the list.
HOW CLEAN IT COMES BACK · US
duck✦
Bounces gone. Traps, seeds, bots and complainers gone too.
cheap cleaning is the expensive kind ✦
8 MIN
per 100,000 addresses
0
emails sent to your subscribers
99.4%
verification accuracy
fair questions

THE THINGS PEOPLE ASKduck

{{f.q}} {{f.icon}}

{{f.a}}

READY TO SEE YOURS?duck

A free evaluation. The report will speak for itself.

Start free See pricing