Why should the Postfix parameter disable_vrfy_command be set to yes on a publicly accessible mail server?

Question

Options

• AIt prevents e-mail delivery attempts to a non-existent user.
• BIt prevents some techniques of gathering existing e-mail addresses.
• CIt enables verification attempts on the sender e-mail address.
• DIt speeds up forwarding of relayed e-mail.

• A
  4% (2)
• B
  73% (38)
• C
  15% (8)
• D
  8% (4)

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