Email Verifier
Verify email addresses the smart way: syntax check plus a live MX record lookup on the domain's mail servers. The OutSends email verifier runs in your browser and never stores your list.
How it works
Get started with email verifier in a few simple steps.
Paste your email list
Type or paste your addresses — one per line or separated by commas. Paste hundreds at a time.
Click Verify Emails
Each address is checked for valid syntax, then its domain is checked for MX records via DNS-over-HTTPS.
Review pass and fail
See a green checkmark for addresses whose domain accepts mail, and a red cross for invalid syntax or missing MX records.
Why use this free tool
Everything you need, integrated in one workspace.
- Real MX record checks, not just syntax
- Checks your whole list in one pass
- DNS lookup happens over HTTPS — your data stays in your browser
- Free forever, no sign-up, no credit card required
Related tools
More free tools to power your email workflow.
Frequently asked questions
What is an MX record?
An MX record tells mail servers where to deliver email for a domain. If a domain has no MX record, it almost certainly cannot receive email, so the address is invalid in practice.
Is the email verifier free?
Yes, the OutSends email verifier is 100% free and runs directly in your browser.
Does it guarantee the mailbox exists?
No. A MX record means the domain accepts mail, but it doesn't confirm a specific mailbox. For a more accurate result, combine this tool with a bounce-safe sending strategy.
Can I verify a large list?
Yes. The tool processes every address in your list automatically. Network checks can take a few seconds per batch.
Ready to send better emails?
OutSends helps you run cold email campaigns from your own Gmail, SMTP, or API provider — free, no credit card.