Sending fraudulent messages from compromised, legitimate accounts to increase the success rate of social engineering attacks. Protective Measures

Using automated bots to test the stolen pairs on various other websites (social media, banking, or retail) to exploit the common habit of password reuse .

Cybercriminals use these lists primarily for the following activities:

If you believe your credentials may be included in such a list, security experts recommend taking these steps immediately: Inside Combolists: How Hackers Build Stolen Credential Data

A combolist is an aggregated database of login credentials often derived from multiple data breaches, phishing campaigns, or infostealer malware. The specific file you mentioned, "x600 GMX Mail Access Combo By E_X_A.txt," likely contains approximately 600 credential pairs specifically targeting accounts. Risks and Criminal Use