StopBouncingEmail Checker — Is This Address Real?
Stop guessing. Check any email address against live mail servers to confirm whether it actually exists and can receive messages — without sending a single email.
100 free checks on signup. No credit card required.
What the Email Checker Looks For
Seven checks run on every email address you submit.
| Check | What it detects |
|---|---|
| Format & syntax | Is the address correctly formatted per RFC 5321? |
| Domain DNS | Does the domain exist and have mail records? |
| MX records | Is a mail server configured to receive email? |
| SMTP deliverability | Does the specific mailbox exist on the server? |
| Disposable service | Is this a throwaway address from a temp-email provider? |
| Catch-all domain | Does the server accept all addresses regardless of mailbox? |
| Role account | Is this a shared inbox (info@, support@, no-reply@)? |
Why Check Email Addresses Before Sending?
Protect sender reputation
Gmail and Outlook penalize senders with high bounce rates, pushing your messages to spam for all recipients — not just the bounces.
Improve deliverability
A clean list reaches the primary inbox. A dirty list with 10%+ invalid addresses trains spam filters to distrust your domain.
Save sending costs
Most email platforms charge per send or per subscriber. Invalid addresses cost money and deliver zero value.
Email Checker FAQ
How do I check if an email address is valid?
Log in to StopBouncing, go to your dashboard, and enter any email address in the single verification tool. You'll see a result within seconds that includes syntax, DNS, MX, and SMTP status. No guesswork — the system actually connects to the mail server to check.
Can I check if an email address exists without sending an email?
Yes. StopBouncing performs an SMTP handshake — simulating the first stage of email delivery — without ever sending a message. The mail server's response tells us whether the mailbox exists, without any email being sent or received.
Is it possible to check email addresses for free?
Yes. Every new StopBouncing account comes with 100 free verification credits. There is no credit card required to sign up and start checking email addresses immediately.
How accurate is the email checker?
StopBouncing achieves over 98% accuracy on clearly valid and invalid addresses. The only uncertainty is catch-all domains, which accept all email by design — these are honestly reported as 'Unknown' rather than guessed.
Start Checking Emails for Free
100 free verifications. No credit card. Results in seconds.