Domain breach monitoring for small businesses
2 min read · Updated October 15, 2026
Domain breach monitoring checks which addresses at your domain appear in new data breaches so you can reset credentials early. Even without a dedicated service, a quarterly corporate check, MFA and good offboarding give small businesses most of the benefit.
What it is
Monitoring looks for your domain’s email addresses in newly discovered breaches. Instead of waiting for a supplier to tell you, you learn which staff were exposed and which incidents were involved.
What to do with an alert
- ✓Identify the affected person and whether the exposed password is still in use.
- ✓Force a password reset and check for rogue forwarding or sign-ins.
- ✓Confirm MFA is on.
- ✓Remind the person to use their work address only for work tools.
See how exposed your team’s email is
Leaked work emails fuel phishing and account takeover. Review your company’s exposure with a corporate audit.
A lightweight routine
Run a corporate exposure check each quarter, after any supplier breach announcement and whenever a new employee joins. Keep a simple log of what you found and fixed.
Include the forgotten addresses
Role mailboxes, old aliases and former employees’ addresses are often the weakest points. Include them in your checks and remove any that you no longer need.
Frequently asked questions
Do we need a paid monitoring service?+
Not always. Regular checks plus MFA can be enough for small teams. Larger organisations may want continuous monitoring.
Will it find every breach?+
No. It covers breaches known to the data source, so treat it as an early warning, not a guarantee.
Who should receive alerts?+
A named owner, such as the IT lead or office manager, so someone is responsible for acting.
Stop guessing. Check your email in seconds.
The free Leakill check looks for your email address in known breach records and tells you whether it was exposed. If it was, an optional detailed report lists the incidents, dates, sources, the kinds of data involved and practical next steps. It is a one-off report, not a subscription.
A breach match is a warning signal, not proof that someone has access to your account today. No public database covers every breach, so a clean result lowers risk without guaranteeing safety.