BounceBrake resolves the catch-all and risky addresses other checkers can’t call. Email the people who are really there, skip the ones that would bounce, and keep your domain’s reputation intact.
0.00¢1234567890123456789.12345678901234567891234567890123456789¢2.98¢ per credit
per credit, pay as you go
FreeDuplicates and typosnever cost a credit
1 creditper unique address
No verdict?The credit comes back
Smartlead + Instantlyvalid leads exported for you
app.bouncebrake.com
catch-all-leads.csv
6 unique addresses, 6 credits
Verifying
Safe to send01234567890123456789
Would bounce01234567890123456789
In progress67890123456789012345
maria.alvarez@harborline.coCatch-all
j.chen@harborline.coCatch-all
procurement@harborline.coCatch-all
sam.okafor@quillwork.ioCatch-all
lena.r@quillwork.ioCatch-all
dev.patel@quillwork.ioCatch-all
Download valid CSVSend to Smartlead
Illustration with example data. Most real lists finish within 24–48 hours.
Works between the tools you already use: CSV exports in, verified leads out
ZeroBounceCSV in
NeverBounceCSV in
MillionVerifierCSV in
BouncerCSV in
DeBounceCSV in
ApolloCSV in
ZoomInfoCSV in
HunterCSV in
SmartleadLeads out
InstantlyLeads out
ClayAPI
ZapierAPI
MakeAPI
n8nAPI
REST APISigned callbacks
The catch-all problem
See what your verifier leaves behind
Catch-all domains accept mail for every address, real or not, so standard verifiers can’t tell them apart and hand them back as unknown. BounceBrake gives each one a straight answer.
Your verifier’s exportrisky.csv
maria.alvarez@harborline.coCatch-all
j.chen@harborline.coUnknown
procurement@harborline.coAccept-all
sam.okafor@quillwork.ioRisky
lena.r@quillwork.ioCatch-all
dev.patel@quillwork.ioUnknown
Confirmed0 of 6
After BounceBrakerisky.csv
maria.alvarez@harborline.coCatch-allSafe to send
j.chen@harborline.coUnknownWould bounce
procurement@harborline.coAccept-allSafe to send
sam.okafor@quillwork.ioRiskySafe to send
lena.r@quillwork.ioCatch-allWould bounce
dev.patel@quillwork.ioUnknownSafe to send
Confirmed6 of 6: 4 to send, 2 bounces stopped
Example list. Your split depends on your data; every resolved address is a lead you keep or a bounce you avoid.
Why it matters
Two bad options, until now
Delete them and lose buyers
Dropping every catch-all throws out the real decision-makers along with the dead addresses, after you paid for the data.
Send blind and take the bounces
Bounces are one of the quickest ways to damage a sending domain. Mailbox providers notice, and outreach tools pause accounts.
Or resolve them first
Send BounceBrake only the addresses your verifier couldn’t settle, then email the real ones with confidence.
How it works
From upload to a list you can send to
No setup and no new workflow. Run your list through the verifier you already use, then send BounceBrake the addresses it couldn’t resolve.
Step 1
Upload the risky segment
Drop a CSV of up to 100,000 unique addresses and pick the email column, or send addresses through the API one at a time or 100 per call.
Drop a CSV here
Up to 100,000 unique addresses
CSV
q4-catch-all.csv
8,412 rows
Uploaded
Email columnfirst_namework_emailcompany
Step 2
See the cost before anything runs
We count unique, well-formed addresses. Duplicates and malformed rows are free, and nothing is charged until you press start.
Ready to start Example
Rows in file
8,412
Duplicates
391 free
Malformed
61 free
Unique addresses to verify
7,960
Cost
7,960 credits
Your balance
12,000
Start verification
Step 3
We resolve every address
Our proprietary verification settles the catch-all and unknown addresses other verifiers can’t. Counts update live; most lists finish within 24–48 hours.
64%
resolved
Safe to send 3,912
Would bounce 1,182
In progress 2,866
Live counts, example data. Most lists finish within 24–48 hours.
Step 4
Take the clean list
Download all, valid or invalid rows as CSV with your columns kept, push valid leads to Smartlead or Instantly, or get a signed callback per address.
q4-catch-all.csv Completed
All rows 7,960Valid only 5,604Invalid only 1,701
S
Smartlead
5,604 valid leads added to “Q4 outbound”
POST /your-callback {"status": "valid", "identifier": "crm-48121"}
Drop a CSV here
Up to 100,000 unique addresses
CSV
q4-catch-all.csv
8,412 rows
Uploaded
Email columnfirst_namework_emailcompany
Ready to start Example
Rows in file
8,412
Duplicates
391 free
Malformed
61 free
Unique addresses to verify
7,960
Cost
7,960 credits
Your balance
12,000
Start verification
64%
resolved
Safe to send 3,912
Would bounce 1,182
In progress 2,866
Live counts, example data. Most lists finish within 24–48 hours.
q4-catch-all.csv Completed
All rows 7,960Valid only 5,604Invalid only 1,701
S
Smartlead
5,604 valid leads added to “Q4 outbound”
POST /your-callback {"status": "valid", "identifier": "crm-48121"}
Built for outbound teams
Pay for answers, not for waste
A workspace for every client
Files, results, API keys and integrations stay separate per client, with one shared credit balance and usage tracked per workspace.
WorkspaceCredits used this month
Harborline outbound4,210
Quillwork EU1,875
Ferndale Studio612
Shared balance3,303 left
Duplicates and typos are free
Addresses are de-duplicated regardless of case or spacing, and malformed rows are marked invalid at no charge.
No verdict, no charge
If an address can’t be settled within 7 days it’s marked unknown and the credit returns to your balance automatically.
An API with signed callbacks
Verify one address, a batch of 100 or a whole file, and get each verdict posted to your endpoint.
POST https://your-app.example/bb
X-BounceBrake-Signature: sha256=9f2c…
{"email": "maria.alvarez@harborline.co",
"status": "valid", "identifier": "crm-48121"}
Straight into your campaign
Pick a Smartlead or Instantly campaign at upload and valid leads land there, with mapped fields, when the file finishes.
SmartleadInstantlyCSV
Pricing
Pay for the addresses you check
One credit tests one unique address. Credits are shared across your workspaces.