Use a reputable service like Have I Been Pwned to see if your email address has been included in a known data breach.

Possessing or distributing stolen credentials can lead to criminal charges under computer misuse laws.

Even if a hacker has your "mail access" password, Two-Factor Authentication (like an app or hardware key) will stop them from getting into your account.

The Hidden Danger of “Combo Lists”: What You Need to Know

If your data is part of one of these 125k lists, you are at risk. Here is how to stay safe: