Proper Check

Service

Email list verification

Upload a CSV or paste addresses. Get a cleaned list with statuses before a campaign or CRM import.

  • CSV and copy-paste
  • Extra columns preserved
  • Export ready for your ESP
Create account See pricing

Why clean a list before sending?

A dirty database raises bounce rate, hurts domain reputation, and costs more in email marketing tools. Pre-send verification is the most affordable deliverability protection.

Self-serve: create an account, upload a list or connect the API without a sales call.

What does the process look like?

The entire flow lives in the customer dashboard, with no sales call required.

  • Upload a CSV file or paste a list.
  • Automatic verification in the bulk queue.
  • Download a file with status and reason columns.

Supported formats

The file can include extra columns (name, company, tags). We preserve them in the export.

What do teams usually remove?

The decision is yours, but most teams remove invalid and disposable addresses and evaluate risky ones based on strategy.

  • Invalid and dead domains
  • Disposable and temp mail
  • Role-based addresses such as admin@ or office@

List quality and bounce rate

ESPs treat hard bounces as a list quality signal. Once you cross the threshold, deliverability drops for the entire domain — not just one campaign. Verifying a list before import to Mailchimp, GetResponse, or your own SMTP is standard practice for agencies and growth teams.

ESP import after verification

The export includes status and classification reason columns. Filter valid for sending, invalid for removal, and risky for a test segment — without clicking through thousands of rows manually.

  1. Upload the list

    CSV from the dashboard or bulk API.

  2. Track progress

    Live job status and processed address count.

  3. Export the result

    Download a file with a status column ready for import.

“We cleaned 40k leads before a cold email push. Bounce dropped from 9% to under 1% — domain reputation recovered.”

Marta, B2B SaaSVerified customer

“We upload a CSV from CRM every week. Export with statuses saves hours of manual checking.”

Tomasz, outbound agencyVerified customer

“Trial credits were enough to judge quality. Then we bought a pack for our B2B newsletter.”

Kamil, marketing automationVerified customer

Related

Bulk email verification Old list cleanup Pricing

Frequently asked questions

Can I upload a file from Excel?

Yes. Save the spreadsheet as UTF-8 CSV and upload it to the dashboard.

How long does verification of a large list take?

It depends on size and queue load. Most lists are processed within minutes.

How long do you store my lists?

Only as long as the service requires and as described in the retention policy in our terms.

Next step

Launch campaigns with a clean list — not a bounce trap.

Create an account and get free test credits. Upload CSV or verify a single address — no sales call required.

Free credits to start CSV export with statuses VAT invoice automatically
from pennies per verification Create free account