Syntax Validation
Catches malformed addresses and common typos before deeper checks.
Clean Lists at Scale
Bulk Email Verifier
Upload CSV files and verify thousands of email addresses in minutes. Automatic deduplication, real-time progress tracking, and segmented result exports.
Comprehensive Checks
What the Bulk Verifier Checks
Every email in your list passes through the same multi-layered verification engine.
Domain & MX Verification
Confirms domain existence and active mail exchange records.
Disposable Email Filtering
Detects temporary email services that create throw-away addresses.
Catch-All Domain Detection
Identifies servers configured to accept mail for any address, flagging uncertain results.
Role-Based Identification
Flags generic addresses like info@, admin@, and support@ with lower engagement potential.
SMTP Mailbox Check
When enabled, confirms specific mailbox existence at the server level without sending mail.
How Bulk Email Verification Works
Upload Your CSV
Drag and drop or select your CSV file. Mailthentic auto-detects the email column and deduplicates your list instantly.
Parallel Processing
Emails are verified in parallel with real-time progress tracking. Monitor job status from your dashboard.
Download Clean Results
Export your cleaned list segmented by status: valid, risky, invalid, and unknown. Send campaigns with confidence.
256-bit SSL Encrypted
No Emails Sent During Verification
No Data Reselling — Ever
98.4% Accuracy Rate
Frequently Asked Questions
What file formats are supported for bulk upload?
Mailthentic's bulk email verifier accepts CSV files. Simply upload your file and the system automatically detects the email column, deduplicates entries, and begins processing.
How many emails can I verify at once?
You can upload lists of any size. Large lists are processed in parallel for maximum throughput. Processing time scales linearly with list size.
Are duplicate emails counted against my credits?
No. Mailthentic automatically deduplicates your list before processing begins, so you only pay for unique email addresses verified.
How long does bulk verification take?
Processing speed depends on list size and verification mode. DNS-only validation is fastest, while SMTP-enabled verification takes slightly longer. You can monitor progress in real time from the dashboard.
Can I download results as CSV?
Yes. Once verification is complete, you can download the full results as a CSV file with all verification statuses, or export only the valid addresses for a cleaned list ready to use in your campaigns.
Ready to Clean Your Email List?
Upload your first list and see how many invalid addresses are hiding in your database.