Email Verification Results Explained: Valid, Invalid, Catch-All and More
A marketer-friendly guide to interpreting email verification results and turning each finding into a documented campaign decision.
Read article →Frequently asked questions
Answers before you upload.
Find practical information about supported files, result statuses, credits, API requests and how ListCleaner handles your workflow.
Files and cleaning
Preparing your data.
Which file formats are supported?
CSV, XLSX, TSV and consistently delimited TXT files are supported. XLSX files must contain one worksheet.
How do I choose the email column?
After upload, the preview displays the detected columns. Click anywhere in the column that contains the email addresses you want to clean.
Are my other columns preserved?
Yes. The selected email column is validated while supporting columns remain available in the exported data.
Can I follow a job while it is running?
Yes. The dashboard refreshes active job progress, and API integrations can request the current cleaning-job status.
Results and credits
Understanding the outcome.
What can I download after cleaning?
You can retrieve the complete result and the available deliverable or non-deliverable subsets for the job.
Do purchased credits expire?
No. Purchased credits remain available until you use them.
How are credits used?
Credits represent verification work and are available to both dashboard and API workflows for the same account.
What does catch-all mean?
A catch-all domain accepts mail without reliably confirming whether the individual mailbox exists. It should be handled according to your own sending policy.
API and privacy
Building and protecting.
Can I verify a single email address?
Yes. The synchronous verification endpoint returns the status directly in the API response.
Can I submit complete files through the API?
Yes. The list workflow supports upload, job-status monitoring and result retrieval.
Where are API credentials stored in the documentation?
The interactive documentation keeps credentials in the current browser session only, so they are cleared when the page session ends.
Where can I read the privacy and processing information?
Review the privacy page and the GDPR/data-processing overview linked in the footer and trust resources.
Still deciding how to begin?
Tell us about your file, integration or cleaning volume.
