Prepare your file
Build a CSV or TXT list of the addresses you want to review, and keep a source copy of the original file.
Bulk email verification
Verify Email Lists in Bulk
Upload a CSV or TXT list, review invalid, risky, disposable, and uncertain results, then download output to prepare cleaner campaign data.
New accounts currently receive 250 welcome credits, which can help you start with a small list.
- CSV & TXT Upload
- Background Processing
- Downloadable Results
- API Access*
- Privacy First
- Credits Per Address
- 250 Welcome Credits
*API access is available on eligible plans.
How bulk email verification works
Lucenri turns list cleaning into a clear upload-to-download workflow so you can review many addresses before your next send.
Upload the list
Upload the file in Lucenri. Lucenri extracts email-like addresses from CSV or TXT content.
Review results
Review valid, invalid, risky, disposable, and catch-all or uncertain results across the list.
Download and clean
Download CSV or TXT results, then update your source list before campaign preparation.
Prepare CSV or TXT for upload
Bulk email verification starts with a cleanable file. Lucenri supports CSV and TXT uploads up to 5 MB.
Supported formats
Upload CSV or TXT files. Other spreadsheet formats such as XLSX are not supported for bulk upload.
File size
The maximum upload size is 5 MB. Per-upload limits may apply to how many addresses are processed in one run.
What Lucenri extracts
Lucenri extracts email-like addresses from the file. Duplicates are skipped during extraction, and invalid-looking entries may be skipped.
Keep a source copy
Keep your original file. Lucenri does not replace your source list automatically, and the product does not offer column mapping or spreadsheet repair.
What happens after you upload
Processing behavior depends on list size. Lucenri does not promise a fixed completion time for every upload.
Smaller lists
Smaller lists often finish in the main verification flow so you can review results sooner.
Larger lists
Larger lists may continue in the background while Lucenri processes the batch.
Progress updates
The dashboard can show progress while a bulk job runs so you can follow status without guessing.
Keep the tab open
When a background job is running, keep the tab open until the job finishes or you see a completed summary.
Review results across your list
Bulk results help you decide what to keep, review, or remove before sending. Categories are decision-support signals, not delivery guarantees.
Valid
Addresses with positive verification signals at the time of the check.
Invalid
Addresses that show signals they are not suitable for sending.
Risky
Addresses that may need review before use because caution signals were found.
Disposable
Addresses that appear to use temporary or disposable email providers.
Catch-all or uncertain
Addresses where available signals may not confirm the mailbox with confidence.
For deeper result definitions and layered checks, see How email verification works. A valid result does not guarantee delivery or inbox placement.
Download results and clean your list
After verification completes, export results and update your own source list before campaign preparation.
Download CSV
Export CSV results from the dashboard when analysis completes.
Download TXT
Export TXT results when you need a simple address list for review.
Update your source
Review downloads, then update your source list manually. Lucenri does not automatically rewrite your original file.
Export in time
Verification results and uploaded data are retained for up to 72 hours. Download files you need within that window.
Common list-cleaning workflows
Bulk email verification supports permission-based list hygiene before campaigns and database cleanup.
Newsletter list cleanup
Review subscriber lists so invalid or disposable addresses can be handled before the next send.
Campaign preparation
Clean campaign segments so your team works with clearer list quality before launch.
CRM data hygiene
Extract and review email-like contacts from exported CRM files as part of routine data care.
SaaS contact review
Check contact databases for invalid, risky, or uncertain addresses before outreach or lifecycle emails.
Event and webinar cleanup
Review registration lists so temporary or invalid signups can be filtered before follow-up messages.
Agency client-list processing
Agencies may process client lists when authorized and the data was collected lawfully. Lucenri is not intended for unsolicited spam campaigns.
Credits, volume, and upload limits
Bulk verification uses credits. Upload size and credit balance are separate limits.
Credits per address
Bulk verification typically uses one credit per verified address.
Welcome credits
New accounts currently receive 250 welcome credits, which can help you start with a small list.
Paid volume
Paid credits are available when you need more verification volume beyond welcome credits.
Packs vs upload limits
Credit packs add prepaid credit balance. They do not define the per-upload limit. Per-upload limits may apply.
API access is available on eligible plans.
Privacy and retention for uploaded lists
Uploaded lists can contain personal data. Lucenri keeps bulk processing privacy-focused and retention limited.
Encrypted connections
Lucenri processes verification requests over encrypted connections.
Up to 72 hours
Verification results and uploaded data are retained for up to 72 hours and removed in line with Lucenri’s retention policy.
No resale
Uploaded lists are not sold or used for Lucenri marketing.
GDPR/AVG-ready
Lucenri is designed with privacy-first processing aligned with GDPR/AVG standards.
Limits and cautious guidance
Bulk verification improves list review, but it has clear boundaries.
- Results do not guarantee delivery or inbox placement.
- Not every mailbox can be confirmed in every situation.
- Catch-all or uncertain results may still need manual review.
- Per-upload limits may apply, and the maximum upload size is 5 MB.
- Keep a source copy of your original file; Lucenri does not auto-replace it.
- Use Lucenri for permission-based, lawful list processing only.
Frequently asked questions
What is bulk email verification?
Bulk email verification lets you upload a CSV or TXT list so Lucenri can check many addresses in one workflow, then review and download the results instead of verifying contacts one by one.
Which file formats can I upload?
Lucenri supports CSV and TXT uploads for bulk email verification. The maximum upload size is 5 MB, and per-upload limits may apply.
How should I prepare a CSV or TXT file?
Include the email addresses you want to verify in a CSV or TXT file up to 5 MB. Lucenri extracts email-like addresses from the file. Keep a source copy of your original file before you upload.
How are verification credits used?
Bulk verification typically uses one credit per verified address. Credit packs add prepaid credit balance and do not define the per-upload limit. Per-upload limits may apply.
Can I use welcome credits for bulk verification?
Yes. New accounts currently receive 250 welcome credits, which can help you start with a small list before choosing a paid option for more volume.
What happens to duplicate or invalid-looking entries?
Duplicates are skipped during extraction. Invalid-looking entries may also be skipped so the verification run focuses on email-like addresses found in your file.
How are risky and catch-all results handled in a bulk list?
Risky and catch-all or uncertain results are grouped so you can review them before sending. They are decision-support signals, not delivery guarantees. For deeper result definitions, see How email verification works.
Can I download my results?
Yes. When analysis completes, you can download CSV or TXT results from the dashboard, then update your source list. Export files you need within the retention window.
Is there a list-size limit?
Per-upload limits may apply. Credit packs add verification credits and do not automatically raise the per-upload limit. For very large lists, contact Lucenri support before uploading.
How long does bulk verification take?
Smaller lists often finish in the main flow. Larger lists may continue in the background. Keep the tab open until the job finishes. Processing time depends on list size and load, and Lucenri does not promise a fixed completion time.
Can agencies verify client lists?
Yes, when the agency is authorized to process the data and the client list was collected lawfully. Lucenri is intended for permission-based list hygiene, not unsolicited spam campaigns.
Does bulk verification guarantee delivery?
No. Bulk verification results reflect signals available at the time of the check. A valid result does not guarantee delivery or inbox placement, because recipient servers and sending conditions can change.
Ready to verify your email list?
Upload a CSV or TXT file, review result categories, and download cleaner list output before your next campaign.