Bulk Verification

Clean an entire list before your next campaign

Upload a CSV and get a status for every address: Valid, Invalid, Catch all, or Unknown. You'll know what to send, what to suppress and what to review before anything leaves your outbox.

No card required. Unknown results never cost a credit.
Bulk Email Verification

A big list can hide a small leak

Most list problems do not look dramatic inside a spreadsheet. They show up later as bounces, messy segments, wasted sends, and teams wondering why a campaign underperformed.

Raw CSV workflow

A raw export can make a team feel ready because the file looks full. Under the surface it mixes active buyers with stale roles, old jobs, throwaway signups, invalid domains, duplicates and unresolved catch-all rows. The campaign starts with volume, but not clarity.

Verified list workflow

The same file becomes clear result groups before the send. Teams see which rows are Valid, Invalid, Catch all, or Unknown, then decide what moves forward, what gets suppressed and what needs review, instead of treating the whole CSV as one equally safe audience.

Single Verification

Verify one email before you act on it

Check an individual address before you send a message, create a contact, update your CRM or move a lead into the next step.

01

Check the address

Review syntax, domain and mail signals before the address enters an important workflow.

02

Get a clear status

Receive Valid, Invalid, Catch all or Unknown.

03

Take the next action

Keep the contact moving, correct it, remove it or send it to review.

Four results,
four different decisions

Every file comes back split into these groups. Each one calls for a different action.

Status

What it means

Typical handling

Valid

The mailbox exists and the server accepted it.

Send. This is your clean segment.

Invalid

The address doesn't exist or the domain can't receive mail.

Suppress. Sending here is what causes hard bounces.

Catch all

The domain accepts mail for any address, so the mailbox can't be confirmed.

Segment separately. Test in small batches on low-risk campaigns.

Unknown

The server gave no definitive answer: greylisting, rate limiting or anti-probing.

Hold for review. These never cost you a credit.

Clean the file before launch

Bulk cleaning is not just a pre-send chore. It is the moment a team decides which contacts deserve volume, which should be removed, and which need a cautious test before launch.

01

Upload the file

Add the CSV or TXT list you want to verify, whether it came from a CRM export, newsletter database, event list or outbound prospect source.

02

Review the breakdown

See how the file separates into Valid, Invalid, Catch all, and Unknown before the campaign or import goes live.

03

Export usable segments

Move valid contacts forward, suppress clear invalids, and route uncertain contacts into a review or lower-risk sending path.

Built for real list work

CSV and TXT upload

Clean exported files from CRMs, lead databases, event lists, newsletters or partner sources without checking every address one by one.

Segmented result groups

Separate Valid, Invalid, Catch all, and Unknown contacts so each group gets the right treatment instead of one risky bulk decision.

Re-import ready output

Bring cleaner segments back into campaign, CRM or agency workflows with less manual cleanup and clearer list-quality reporting.

What to expect
before you upload

What goes in, what comes out, and what happens to your data.

Going in

Your file

File formats

Forms, CRMs, spreadsheets and file drops: anything already running in your stack.

Column mapping

Detected automatically

Processing time

30–45 minutes for 100,000 rows

Coming out

Your results

Result groups

Valid, Invalid, Catch all, Unknown

Duplicates

Detected and flagged in the output

Unknown results

Never charged. 0 credits

Your data

What we do with it

In transit

Encrypted

Use

Used for verification only

Sharing

Never sold, shared or resold as data

Above 2% bounces,
Gmail stops asking politely

Bounce rate used to be a soft metric. Gmail now permanently rejects senders that cross a 2% hard-bounce rate, and Microsoft enforces the same limit. That turns list hygiene from good practice into a condition for reaching the inbox at all.

2

%

Hard-bounce ceiling at Gmail and Microsoft

20–30

%

Annual decay of an untouched B2B list

90

days

After which a list is worth re-verifying

FAQs

Questions about Bulk Validation

How often should I verify my email list?

How long does it take to clean a CSV with 100,000 emails?

Why can't I just use Excel to clean my email list?

Is it secure to upload my customer data to a bulk validator?

What formats do you accept for bulk uploads?

USE CASE

Verify email addresses before they become bounced sends

Check whether an email address is properly formatted, connected to a working domain, and safer to contact before you send or store it.

01

Enter the email address you want to verify

02

Receive a Valid, Invalid, Catch all or Unknown result

03

Decide whether to send, suppress or review the address

Best for:

Checking one contact at a time

Clean your list
before the next send

Start with 1,000 free verifications. No card, and unknown results never cost a credit.

Email check image