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Re: Discovering users by RCPT TO

Subject: Re: Discovering users by RCPT TO
Date: Thu, 13 Jan 2005 13:20:15 -1000
On Thu, Jan 13, 2005 at 02:20:12PM -0500, Chris Buechler wrote:
I'd recommend disabling it unless you get flooded by such spam
attacks. I would probably consider it unnecessary information
disclosure, depending on the environment and reason (if any)
for doing it that way.

Some MTAs allow permit you to drop the session after a certain
number of failures, but that only slows down the dictionary
attacks.

You cannot disable RCPT TO because that is how the SMTP protocol
designates the recipients.

-Vince

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