smtp-user-enum
Username guessing tool for the SMTP service
Platforms: Linux · Last verified September 6, 2026
Username guessing tool primarily for use against the default Solaris SMTP service. Can use either EXPN, VRFY or RCPT TO.
Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.
Getting started
Install on Kali Linux with `sudo apt install smtp-user-enum`. See the official Kali tool page and upstream homepage linked above for full usage and configuration details.
