Answer: C
There are capabilities in SMTP which can be used to enumerate users or at least email addresses:
EXPN command – available in ESMTP, used to expand mailing lists – i. e. when you find such address, try it with this command
• Whether this command is supported can be found in EHLO response.
VRFY command – verify users, but not all servers has this feature enabled.
• Postfix server has VRFY enabled by default:
o Status code 250 = success,
o Status code 252 = address can’t be verified but server will attempt to deliver the message.
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NikoTomas
5 days, 19 hours ago