Email Breach Checker
Check if your email provider has been involved in known data breaches. View timeline, severity ratings, and what data was exposed - 100% client-side.
Check Breach History
Your email is analyzed locally - it's never sent to our servers
How It Works
1. Enter Email
Type any email address. Analysis happens 100% in your browser.
2. Breach Scan
We check against our database of known breaches with severity ratings.
3. Get Report
See breach timeline, data exposed, and actionable steps to protect yourself.
Frequently Asked Questions
How does the Email Breach Checker work?
We check your email domain against a curated database of publicly known data breaches. The analysis runs entirely in your browser - your email address is never sent to our servers.
Does this check if my specific email was breached?
This tool checks if your email provider/domain has been involved in known data breaches. For individual email breach checking, we recommend using haveibeenpwned.com alongside this tool.
What should I do if my provider has breaches?
Change your password immediately, enable two-factor authentication, and consider switching to a more secure provider. Use temporary emails from Temp Postal for non-essential signups to minimize future exposure.
Is my email stored when I use this tool?
No. The analysis is 100% client-side. Your email never leaves your browser.
Don't Wait for the Next Breach
Use temporary emails for signups and trials to keep your real inbox safe from future breaches.
Quick answer
How do you check whether an email address has been in a data breach?
- Covers publicly disclosed breaches, the same corpora security researchers use.
- Reports the incident and the data categories exposed, not just a yes or no.
- No account, no email required to see the result, no storage of what you checked.
- A clean result means no known public exposure, not proof of safety.
What a breach hit actually means
A hit means your address was present in a dataset that became public. Depending on the incident, that dataset may have contained only addresses, or it may have contained password hashes, physical addresses, phone numbers or purchase history. The categories reported tell you which risk applies.
The most common practical consequence is not account takeover but permanent enrolment in spam and phishing lists. Address lists are traded, merged and resold, so a single exposure in 2019 still produces mail today. That is why changing a password fixes the account but not the inbox.
What to do after a hit, in order
First, change the password anywhere that address is used with the same password, starting with email, banking and anything holding payment details. Reused passwords are how one breach becomes several compromised accounts.
Second, turn on two factor authentication on the accounts that matter. An exposed password becomes far less useful to an attacker who cannot pass the second step.
Third, change the pattern that caused it. Stop giving the same address to every service. Use a disposable address for signups you do not need to keep, so the next breach exposes an address that expires rather than the one attached to your identity.
Why a clean result is not a guarantee
Breach corpora only contain incidents that have been disclosed and published. Many breaches are never detected, and disclosed ones often surface years later. A clean result today means nothing is publicly known about that address, which is worth knowing but is not the same as being safe.
This is a reason to treat exposure as inevitable rather than exceptional. Structuring your addresses so that any single exposure is contained is more durable than trying to keep one address clean forever.
How disposable addresses limit the damage
When a signup gets its own temporary address, a breach at that service exposes an address that no longer receives mail and that cannot be joined to your other accounts. The data broker who buys the list gets a dead record.
This works because the value of a leaked address comes from its persistence and from its use across services. A disposable address has neither property, which is the whole mechanism.
Frequently asked questions
Do you email me the results?
No. Results appear on screen. We do not ask for a contact address, which means there is nothing to send and nothing to add to a list.
Is it safe to type my real address here?
The address is used for the lookup and discarded. It is not logged, stored or associated with any profile.
Which breaches are included?
Publicly disclosed incidents that have been catalogued by the security research community. Undisclosed breaches cannot be included by anyone.
My address appears in several breaches. Is that unusual?
No. Any address used widely for a decade will usually appear in several. What matters is whether passwords were reused and whether the address remains your primary identifier.
Can I check someone else's address?
Technically yes, since the data is public. Doing it to monitor another person is a poor use of the tool and, depending on where you live, may be unlawful.