The MAIL ACCESS 2K Leak Gave Hackers Working Logins to 1,587 Inboxes

HEROIC analysts identified a file titled "MAIL ACCESS 2K MIX DOMAIN VALID 100" uploaded to a Telegram channel on 04-Apr-2026. The list contains 1,587 records of email addresses and plaintext passwords, paired with the URLs where those logins were captured. The word "valid" in the file name signals that the seller has already confirmed these email logins still work, making the list smaller but more immediately useful to a buyer.

Why This Is Dangerous

A "valid" mail access list means someone has already tested the credentials and confirmed they open real inboxes. That is a direct route into a person's email account, which is often the single most powerful account an attacker can control, since email is used to reset passwords for banking, shopping, and social media logins. With the password stored in plaintext, there is nothing standing between the file and full access to that inbox.

What Was Exposed in the MAIL ACCESS 2K MIX DOMAIN File

• Email addresses
• Plaintext passwords
• URLs of the mail services where the credentials were used

Why This Matters Even With a Small Record Count

1,587 records is a small list compared to some breaches, but a "valid" verified mail access list can do more damage than a much larger unverified one. Every entry has already been confirmed to log in successfully, so an attacker skips the trial and error of credential stuffing and goes straight to account takeover. From an open inbox, attackers can reset passwords on other accounts, intercept verification codes, and set up identity theft or financial fraud using whatever personal information sits in the mailbox.

How a Verified Mail Access List Gets Made

Sellers build these lists by testing stolen or leaked email and password combinations against live login pages, then keeping only the pairs that successfully connect. The result is labeled "valid" to signal quality to buyers on Telegram and dark web marketplaces, who pay more for a smaller list of confirmed working logins than a larger list of unverified ones. The credentials themselves usually originate from phishing pages, malware infections, or older breaches before being tested and repackaged this way.

Check If You Are Affected

If you think your email might be part of this exposure, it is worth checking without delay, since these credentials have already been confirmed to work. HEROIC's free breach scanner searches more than 400 billion leaked records to tell you quickly whether your information has been compromised and what to do next.