Description
The SMTP service has two internal commands that allow the enumeration of users: VRFY (confirming the names of valid users) and EXPN (which reveals the actual address of users aliases and lists of e-mail (mailing lists)). Through the implementation of these SMTP commands can reveal a list of valid users.
Module options
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/scanner/smtp/smtp/enummsf undefined(enum) > show actions ...actions...msf undefined(enum) > set ACTION < action-name >msf undefined(enum) > show options ...show and set options...msf undefined(enum) > runPrioritise with Active Threat Intelligence
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