Turn on Multi-Factor Authentication (MFA/2FA) for your email and all linked accounts.
If you believe your data might be included in a "combo" list:
Attackers use "checkers" or "brute-force" tools to see which pairs still work. 10k Mail Access Combo.txt
These files often originate from data breaches or phishing campaigns.
Use Have I Been Pwned to see if your email has been leaked. Turn on Multi-Factor Authentication (MFA/2FA) for your email
Usually formatted as email:password or username:password .
They are frequently sold or shared on hacking forums for "credential stuffing" attacks. and private documents.
Accessing an email account often grants access to everything else—bank accounts, social media, and private documents.