Email checker online — zero friction
Verify email addresses in seconds with Email Checker Online
Run instant checks with live SMTP and MX lookups, catch-all detection, and disposable-domain filtering. Clean full lists and cut bounces before you send.
Live
SMTP + MX check
1000
Emails per batch
0
Emails stored
$0
Free, no sign-up
Check an email now
Free, instant, no sign-up. We never store your data.
Need to clean a whole list? Try bulk checker →
Bulk email checker online
CSV + TXTUpload a CSV or paste up to 1000 emails per batch. Get a clean report with valid, risky, and invalid statuses plus DNS notes.
- File uploads with optional column picker
- Progress updates and CSV export
- Disposable domain filter and catch-all detection
API and automation
RESTPlug the email checker online into forms, CRMs, and signup flows. Straightforward JSON responses and friendly rate limits.
- Single-email endpoint with clear JSON results
- HTTPS by default, CORS enabled for web apps
- Fast responses with sensible caching
How it works
Three-step validation flow
01
Syntax and DNS
RFC-compliant parsing and MX discovery to ensure the domain is prepared to receive mail.
02
SMTP handshake
Lightweight connection attempts with timeouts to confirm the mailbox is reachable without sending mail.
03
Result and export
Clear statuses (valid, risky, invalid), reasons, and export-ready CSV for your marketing or product stack.
Frequently asked questions
Is Email Checker Online really free?
Yes. The email checker online is free for single checks and reasonable bulk batches so you can clean lists without friction.
Do you store validated emails?
No. Checks run in-memory and results are returned to you; we do not persist email addresses.
What makes results reliable?
We combine syntax validation, MX records, SMTP handshake, disposable domain filtering, and catch-all detection to reduce false positives.
Can I automate validations?
Yes. Use the REST API single-validation endpoint to check addresses from forms, CRMs, and signup flows via simple HTTP calls.
Latest from the Blog
What is an SPF Record?
Learn why SPF records are crucial for your email deliverability and how to set them up.
MX Records: The Backbone of Email
Understanding how Mail Exchange records work and how to troubleshoot them.