How the Mail Access Combolist Verified 43,517 Stolen Email Logins

HEROIC analysts found a combolist titled "MAIL ACCESS 45K ALL DOMAIN VALID 100" that was leaked on June 5, 2026 and later surfaced on a Telegram channel. The file's name advertises 45,000 records, but the verified file contains 43,517 entries pairing email addresses across many different domains with plaintext passwords, plus the URLs those logins connect to. Why This Is Dangerous: This is a "mail access" combolist, meaning the passwords in it have reportedly been checked against real email logins rather than just scraped from an old breach. Combined with the fact that the passwords are stored in plaintext, this makes the file more dangerous than a random list, since the credentials are more likely to still work. What Was Exposed: - Email addresses across multiple domains - Plaintext passwords - URLs tied to the mail accounts Why This Matters: Email accounts are often the key to everything else. Someone who gets into your inbox can use password reset links to break into your banking, shopping, and social media accounts, one after another. A combolist advertised as "valid" and spanning "all domains" is built specifically to make that kind of account takeover faster and easier, which raises the risk of identity theft and financial fraud for everyone on this list. How a Combolist Like This Works: Sellers build combolists like this one by testing large batches of stolen email and password pairs against real login pages, then keeping only the combinations that successfully log in. That validation step is why files are labeled "valid" and sold at a premium compared to unchecked lists. The credentials themselves usually originate from older breaches, phishing pages, or malware-infected devices, then get filtered, repackaged, and shared on Telegram or hacking forums. Check If You Are Affected: HEROIC's free breach scanner checks your email against a database of more than 400 billion leaked records, so you can quickly see if your credentials appeared in this combolist or any other exposure.