Verify Your Entire Email List — SMTP-Checked, Categorized, Ready to Send
Upload a CSV, XLS, XLSX, or TXT file — or import directly from Google Drive, Dropbox, or OneDrive — and let EmailVerify.io run SMTP-level checks on every address. Get a clean, categorized export with status and sub-status per contact. For API integration, see the Bulk Email Verification API page.
99%
Accuracy per address
5,000
Addresses per API batch
7
Result categories
100 free credits · credits refunded for unknown status · no credit card required
Drop your email list here
CSV · XLS · XLSX · TXT
Or import from
Submit Once, Track Progress, Download Clean Results
Bulk verification is fully asynchronous — your application never blocks waiting for results. Submit a list, receive a task_id, poll for progress, and download when complete.
Upload Your Email List
Import a CSV, XLS, XLSX, or TXT file directly from your device, or connect Google Drive, Dropbox, or OneDrive. Lists of any size are supported — from small campaign batches to large CRM exports.
Automated Verification on Every Address
EmailVerify.io processes every address through syntax validation, DNS/MX lookup, blacklist screening, and a live SMTP handshake — the same pipeline as single-address verification. Watch real-time progress directly in your dashboard as the list is processed.
Download Categorized, Export-Ready Results
Every address receives a status (valid, invalid, catch-all, do-not-mail, unknown, role-based) and a sub-status. Download the clean segment and import it straight into your ESP or CRM. Credits are automatically refunded for any unknown-status results.
Bulk Verification Built the Way Production Systems Expect It
Async processing, honest results, and the same SMTP-level accuracy per address as single verification — at any scale.
Dashboard Progress Tracking
Watch your list process in real time from the EmailVerify.io dashboard. A live progress bar updates as each address is verified — no need to refresh or wait for a notification.
SMTP-Level Check on Every Address
Every address runs a live SMTP handshake with the receiving mail server — not just syntax and DNS. Up to 99% accuracy per contact, no message sent to the recipient.
7 Status Categories + 11 Sub-Statuses
Results include valid, invalid, catch-all, do-not-mail, unknown, role-based, and skipped statuses. Sub-statuses like mailbox-not-found, disposable, greylisted, no-DNS-entries, and blocked-domain give your team the precision to segment and act immediately.
Credits Refunded for Unknown Status
When an address returns unknown — typically because the SMTP server greylisted or timed out the check — the credit cost is automatically refunded. You only pay for addresses that produce a definitive result.
Disposable, Catch-All & Role-Based Detection
A continuously updated disposable-domain index flags throwaway inboxes. Catch-all domains are honestly reported rather than falsely marked valid. Role-based addresses (admin@, info@, support@) are flagged in sub-status.
Every Major File Format & Cloud Source
CSV, XLS, XLSX, and TXT uploads supported. Direct import from Google Drive, Dropbox, and OneDrive. Export the verified list back to your ESP, CRM, or data tool. For programmatic batch submission, see the Bulk Email Verification API page.
Upload From Anywhere — No Conversion Needed
EmailVerify.io accepts your list however it's stored. Dashboard upload, cloud import, or direct API — the verification pipeline and results format are identical.
Dashboard File Upload
Cloud Storage Import
Building on the API?
If you need programmatic batch submission, async task_id tracking, or integration into your own application, visit the dedicated Bulk Email Verification API page for full endpoint documentation, code examples, and SDK guides.
View Bulk API Docs →Who Uses Bulk Email Verification — and Why It Pays for Itself
Pre-Campaign List Cleaning
Scrub your list before every major send. Invalid, disposable, and role-based addresses are removed before they reach your ESP — cutting hard bounces below industry thresholds and protecting your sender domain from spam-filter triggers.
CRM Import & Ongoing Hygiene
Validate contacts in bulk the moment they enter your CRM from lead forms, trade-show scans, or purchased datasets. Bad data compounds: one unverified import can degrade your entire sending reputation within a single campaign cycle.
Dormant List Reactivation
Email lists age. Addresses that were valid 18 months ago may now be abandoned, recycled as spam traps, or deactivated. Verify before re-engaging to avoid spam complaints and hard bounces from accounts that no longer exist.
Third-Party & Acquired Data Intake
When you receive data from a partner, co-registration, or list broker, quality is unknown. Bulk verify the entire dataset before it touches your sending infrastructure — the cost of one bad send far exceeds the cost of verification.
Integrating Bulk Verification into Your Application?
The Bulk Email Verification API page has everything you need: full endpoint docs, batch submission examples in 6 languages, async result polling, and SDK guides.
Frequently Asked Questions
How do I verify my email list?
Sign in to your EmailVerify.io dashboard and upload your email list as a CSV, XLS, XLSX, or TXT file — or import it directly from Google Drive, Dropbox, or OneDrive. The dashboard processes your list automatically, shows real-time progress, and notifies you when verification is complete. You can then download a clean, categorized export with a status for every address.
What result categories does bulk verification return?
Every address in your verified list receives a status — valid (safe to send), invalid (mailbox does not exist), catch-all (domain accepts all mail but individual mailbox is unconfirmed), do-not-mail (disposable, role-based, or opt-out address), unknown (server timed out), role-based (admin@, info@, support@), or skipped. A sub-status adds further detail — for example, mailbox-not-found, no-DNS-entries, disposable, greylisted, or blocked-domain — so you can segment and act immediately.
Are credits refunded for unknown status results?
Yes. When an address returns unknown — typically because the receiving mail server timed out or greylisted the check — the credit cost is automatically refunded to your account. You only pay for addresses that receive a definitive result. This protects you from losing credits on temporary server issues outside your control.
How many emails can I verify at once?
There is no hard limit on list size through the dashboard — upload files of any size and EmailVerify.io handles the processing automatically. Larger lists are queued and processed in the background. You can close the dashboard and return when complete; results are saved to your account and available for download at any time.
How long does bulk email verification take?
Processing time depends on list size and the diversity of domains in your list. Most lists under 10,000 addresses complete within minutes. Larger lists run in the background — you see live progress in the dashboard and can close the tab without interrupting verification. Results are saved to your account and ready to download once complete.
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