"HQ-Mail-Access" is common slang in hacker forums for "High Quality" mail access. This indicates the credentials (usually in email:password format) are claimed to be valid or verified for logging directly into email accounts.
Attackers use these lists to gain unauthorized access to personal or corporate email accounts. 300-K HQ-Mail-Access .txt
Automated software systematically tests these leaked pairs against various websites to find matches. Recommended actions "HQ-Mail-Access" is common slang in hacker forums for
Combolists and ULP Files on the Dark Web: A Secondary ... - Group-IB 300-K HQ-Mail-Access .txt
Files like these are often distributed or sold on dark web forums and Telegram channels.