The Mail Access 5K Mix Dump Quietly Leaked 4,487 Logins

The "Mail Access 5K Mix" Combolist Quietly Leaked 4,487 Email Logins

On August 5, 2026, HEROIC's threat intelligence analysts identified a combolist labeled "MAIL ACCESS 5K MIX VALID 100" circulating on Telegram. Despite the "5K" in its name, the verified file contains 4,487 records, each pairing an email address with a plaintext password and the URL of the account's login page. The listing markets the credentials as 100 percent checked and valid, with most accounts tied to the United States.

Why "Valid 100" Makes This Especially Dangerous

A label like "valid 100" means the seller has already tested every single credential pair and confirmed it currently works. That removes the guesswork an attacker would normally face sorting through a mix of dead and working accounts, and leaves a list where essentially every entry is ready to use immediately. Combined with plaintext passwords and the exact login URL for each account, there is nothing standing between this file and someone accessing 4,487 inboxes.

What Was Exposed in the Mail Access 5K Mix Dump

• Email addresses
• Plaintext passwords
• URLs linking each credential pair to its login page

Why Email Account Access Is a Bigger Risk Than It Looks

Losing control of an email account is rarely the end of the damage, it is usually the beginning. Whoever holds these credentials can use the inbox to reset passwords on other services, intercept account recovery emails, and impersonate the owner in messages to contacts. If any of these passwords are reused elsewhere, the exposure extends into credential stuffing, account takeover, and financial fraud on completely unrelated accounts.

How a "Valid" Combolist Like This Gets Built

Sellers who advertise a combolist as checked or valid have typically run automated tools against each credential pair to confirm it still logs in before listing the file for distribution. The underlying data usually comes from older breaches, phishing campaigns, or malware infections, gathered from multiple sources and combined into one list. Once verified, files like "MAIL ACCESS 5K MIX VALID 100" are uploaded to Telegram channels or dark web forums, where they are shared or sold to buyers looking for working accounts.

Check If Your Email Was Part of This Leak

You do not need to wait to find out if your email is one of the 4,487 in this file. HEROIC's free breach scanner checks your address against a database of more than 400 billion leaked records, including combolists like this one, and tells you immediately if you were exposed. If you find a match, change the password right away and review your account recovery settings so a verified list like this one cannot be used against you again.