A little clarity goes a long way.

Your guide to uploading, checking, and downloading your email lists.

1. Assess your list

Upload CSV or TXT, choose the email column, and tell us whether the first row contains column names. Free preprocessing counts duplicates, skipped entries, and eligible addresses. The current review release accepts up to 1,000,000 emails and 100 MB per file.

Upload multiple lists

You can upload and verify multiple email lists from the same account. Each list has independent progress, credit accounting, cancellation, and downloads; jobs run concurrently when provider capacity is available.

2. Start verification

You can use your one-time ten-check trial for a small eligible list, or enough paid credits for a larger one. Trial attempts include unknown results; paid credits are consumed for valid, invalid and unknown results. Duplicates are never charged. A draft does not use any allowance.

3. Understand your results

Valid means the provider returned a positive verification result. Invalid means a negative result. Unknown means there was no conclusive answer; it does not automatically mean the address is invalid. Catch-all and temporary server conditions may produce inconclusive results.

4. Download your report

Choose verified addresses, invalid addresses, unknowns, or the full report. The full report preserves original columns and adds status, detailed reason, and input classification. Verification cannot guarantee inbox placement or future deliverability.

Credits and cancellations

Unknown results use one credit each. Only unprocessed addresses release reserved credits. Paid credits never expire, so unused credits remain in your account for future lists. A queued job can be canceled before submission. Once provider processing starts, cancellation may be delayed or refused, and completed checks may still be charged.

Get help

Open Help & support in your workspace to submit a request. Include the job ID and a description, without API secrets or your full contact list.