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How to do it...

The SMTP User Enumeration Utility auxiliary module, by default, will use the unix_users.txt file located at /usr/share/metasploit-framework/data/wordlists/, but you can specify your own. To run the module, set the target address range, the number of concurrent threads, and type run:

msf > use auxiliary/scanner/smtp/smtp_enum msf auxiliary(smtp_enum) > set RHOSTS 192.168.216.129msf auxiliary(smtp_enum) > set THREADS 256THREADS => 256msf auxiliary(smtp_enum) > run[*] 192.168.216.129:25 - 192.168.216.129:25 Banner: 220 metasploitable.localdomain ESMTP Postfix (Ubuntu)[+] 192.168.216.129:25 - 192.168.216.129:25 Users found: , backup, bin, daemon, distccd, ftp, games, gnats, irc, libuuid, list, lp, mail, man, news, nobody, postgres, ...

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