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

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

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

A.
It prevents e-mail delivery attempts to a non-existent user.

B.
It prevents some techniques of gathering existing e-mail addresses.

C.
It enables verification attempts on the sender e-mail address.

D.
It speeds up forwarding of relayed e-mail.



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