* Open your BackTrack machine
* GoTo Applications->BackTrack->Information Gathering->Network Analysis->SMTP Analysis
* Choose smtp-user-enum
* Execute:
./smtp-user-enum.pl -v -M RCPT -u info@example.org -t mail.example.org |
-v Verbose
-M mode Method to user for username guessing (RCPT here)
-u user Check if this user exists
-t host SMTP server
