Live SMTP mailbox checks · No signup · Free

Real inboxes.
Every time.

Real-time and bulk email verification: syntax, domain and MX, disposable & role detection, live mailbox (SMTP) check, catch-all and a 0 to 100 confidence score. Paste one address, or upload a whole list and download it clean.

We never ask for passwords or payment. Nothing to install, and your data is never sold.

Verifying before you send helps reduce bounce rate and protect your sender reputation, especially for cold outreach.

Live mailbox checks 0 to 100 confidence score CSV & Excel bulk upload

Verify a whole list in one click

Upload a CSV or Excel file with an email column. We verify each address, add the results, and give you a clean sheet to download.

Drop your file here or click to browse
.csv, .xlsx, .xls · up to 500 emails per file
file.csv
New here? Download a sample CSV or Excel to see the exact format.
Verifying…0 / 0
0
Valid
0
Invalid
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Risky
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Unknown
Download verified sheet

How the bulk check works

  • 1Upload a CSV/Excel file with a column headed Email.
  • 2Each address is validated: syntax, MX, disposable, role, live SMTP mailbox and catch-all.
  • 3Download the same sheet with Status, Score, Confidence, SMTP & Reason columns added.
  • 4Every row is scored 0 to 100 and labelled valid, risky or invalid so you can filter with confidence.
  • 5No signup, nothing to install, and your file is deleted automatically within a few hours.

Every check that matters, in one call

Seven layers of validation so you keep your sender reputation and your money.

Frequently asked questions

Everything you might want to know before you upload a list.

Is EmailVerify really free?
Yes. The web app is free to use, with a limit of 500 emails per file for bulk uploads. Programmatic access is available through our API on RapidAPI, which has both free and paid tiers for higher volume.
Do you store my email list?
Uploaded files and the verified result file are stored only long enough to run the job and let you download it, then deleted automatically within a few hours. Individual results may be cached briefly to speed things up. See our Privacy Policy.
How accurate are the results?
Syntax, domain/MX, disposable and role checks are highly reliable. The live SMTP check confirms most mailboxes directly. Some providers (notably Gmail and Outlook) rate-limit or hide mailbox existence, so those can return "risky" or "unknown" rather than a definitive answer. Full detail on our How it works page.
Do you send emails to the addresses I check?
No. We only open an SMTP conversation with the mail server to test whether the mailbox exists. No actual email is ever delivered to the address.
Why does a real-looking email show "risky" or "unknown"?
Usually because the domain is catch-all (accepts every address), the mail server greylisted our probe, or a large provider throttled the check. These are honest signals that the mailbox could not be confirmed at that moment, not a definite failure.
What file formats can I upload?
CSV, XLSX and XLS, up to 500 emails per file. Just include a column headed "Email". You can grab a sample CSV or sample Excel to see the format.
Is my data sold or shared?
Never sold. The only third parties involved are the DNS and mail servers we query to verify each address, and RapidAPI if you use the API. See the Privacy Policy and Disclaimer.
Can I use EmailVerify inside my own app?
Yes. The same verification engine is available as a REST API on RapidAPI, returning JSON you can drop into signup forms, CRMs or pipelines.
Who is behind EmailVerify?
EmailVerify is built and maintained by Techforce Global, a software engineering company specialising in AI solutions, data intelligence, AWS cloud and automation. See more of what we build at techforceglobal.com.
Do you build custom email, data or AI solutions?
Yes. Beyond this free tool, Techforce Global delivers custom AI agents, data pipelines, deliverability and CRM integrations, and cloud engineering. Talk to our team about your project.