This entry summarizes multiple public services for checking whether personal data appears in leaked databases.

• https://sec.hpi.de/ilc/: HPI Identity Leak Checker is an academic service that searches an HPI research database for email addresses and related personal data, returns obfuscated notifications by email, and emphasizes privacy and research use.
• https://monitor.mozilla.org/: Mozilla Monitor scans known breaches for your email, offers free scans and continuous monitoring, and guides users through remediation while respecting user privacy.
• https://haveibeenpwned.com/ Have I Been Pwned is a widely-used public breach index that provides email and domain search, Pwned Passwords, APIs, and subscription alerts for individuals and organizations.
• https://leakchecker.uni-bonn.de/ Uni Bonn LeakChecker is a university-operated tool (powered by Identeco) that tests email accounts against leaked datasets and returns results by email with clear privacy notices.

YOPmail provides free, web-based disposable email inboxes accessible without registration. Pick any inbox name at @yopmail.com (or use alternate domains and the random address generator) and read mail instantly in the browser. Inboxes are not password-protected and messages are kept for 8 days by default. Inbox names persist on the service (YOPmail notes inboxes "already exist" and are not deleted), so choose unique names or use aliases for extra privacy. You can reply to messages and send to other YOPmail addresses; sending anonymous emails to external mailboxes is prohibited. Useful for sign-ups, testing, and avoiding spam but not suitable for sensitive or confidential communications. The site is donation-supported and displays a consent/advertising partners banner (tracking/analytics present).

Key features:

• No registration or password required; open any inbox by name.
• Messages retained 8 days; manual deletion is possible.
• Random address generator, alternate domains, and aliases for added privacy.
• Reply capability and YOPchat; external anonymous sending blocked to prevent abuse.
• Free to use; privacy caveats mean avoid using for sensitive data.