SMTP Enumeration
Connect and verify users
nc -nvvv 192.168.1.242 25
Inside the SMTP session:
VRFY John
VRFY Eva
Metasploit
search type:auxiliary name:smtp
use auxiliary/scanner/smtp/smtp_version
use auxiliary/scanner/smtp/smtp_enum
nc -nvvv 192.168.1.242 25
Inside the SMTP session:
VRFY John
VRFY Eva
search type:auxiliary name:smtp
use auxiliary/scanner/smtp/smtp_version
use auxiliary/scanner/smtp/smtp_enum