Business email breach check: how to check your company’s exposure
2 min read · Updated November 8, 2026
A business email breach check looks for your company’s email addresses in known breaches so you can fix risks before attackers use them. List your domains and key addresses, check them against breach records, rank findings by account importance and enforce password resets and two-factor authentication.
Why check company addresses
Employees often use work emails to sign up for outside services. When those services are breached, the work address and sometimes a reused password end up in leaked data, which attackers then use for phishing and account takeover.
What to include
- ✓All company domains and common aliases.
- ✓Executives, finance, HR and IT administrators, who are targeted most.
- ✓Shared mailboxes and service addresses.
- ✓Former employees whose accounts are still active.
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.
How to act on results
- ✓Prioritise people with access to money, data or admin systems.
- ✓Require password resets where exposure is found, and block reuse of leaked passwords.
- ✓Enforce two-factor authentication on email and key tools.
- ✓Brief affected staff about phishing that mentions the breached service.
Make it a routine
A one-off check helps, but new breaches appear all the time. Repeat the review on a schedule, and when people join or leave, so that gaps do not build up.
Frequently asked questions
Can I check a whole domain at once?+
Yes, with a domain-level review or a corporate audit, which is more practical than checking addresses one by one.
Is an exposed work email always dangerous?+
Not always, but it raises phishing risk and becomes serious when the password was reused or two-factor authentication is missing.
How often should we check?+
Quarterly is a sensible baseline for small teams, plus after any known incident or staff change.
Stop guessing. Check your email in seconds.
The Leakill scan looks for your email address in known breach records and delivers a detailed report: the incidents, dates, sources, the kinds of data involved and practical next steps. It is a one-time $1.99 payment, 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.