This suggests a low "bounce" or "failure" rate. HQ lists usually mean the data hasn't been "public" for long and isn't yet saturated or flagged by security systems.
: Turn on MFA—ideally using an authenticator app or hardware key—on your email accounts. Even if an attacker buys a valid combolist with your correct password, MFA will block their login attempt. 220k mail access valid hq combolist mixzip hot
Access to a valid email inbox is the holy grail for identity thieves. Attackers can read sensitive personal correspondence, look for tax documents, or send highly convincing phishing emails to the victim's contacts from a legitimate, trusted address. Account Takeover (ATO) Cascades This suggests a low "bounce" or "failure" rate
Use reliable breach-checking tools like Have I Been Pwned to see if your email address has been flagged in recent public data dumps. Even if an attacker buys a valid combolist
A claim that the credentials have been recently "checked" and are currently working.