SMTP Users enumeration

* Open your BackTrack or kali linux machine

* GoTo Applications>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

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