SMTP enumeration involves querying an SMTP server to gather information about its configuration and user accounts. The VRFY command is used to verify the existence of a specific user or email address, while the EXPN command is used to expand a mailing list or alias. By successfully using these commands, an attacker can obtain confirmation of valid users, email addresses, aliases, and mailing lists on the target system
SMTP provides the following three built-in commands.
VRFY: Validates users
EXPN: Displays the actual delivery addresses of aliases and mailing lists
RCPT TO: Defines the recipients of the message
C is correct.
The Simple Mail Transfer Protocol (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 emails (mailing lists).
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