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| Subject: | Re: Discovering users by RCPT TO |
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| 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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