While there is no widely documented public library or project officially named MailKeker.py
The Loop: A for loop that iterates through a CSV list of recipients.
Ease of Use: As a Python-based utility, it can be integrated into larger automation workflows or used as a standalone tool via the command line. How to Use MailKeker.py
There is currently no publicly documented software, script, or malware widely known as "MailKeker.py"
The most effective defense is SMTP Tarpitting. Configure your MTA (Mail Transfer Agent) to artificially delay responses after multiple invalid RCPT TO attempts from the same IP. When MailKeker.py hits a tarpit, the scripts multi-threading breaks, and a 30-second delay per email makes enumeration computationally expensive.