Re: Dictionary Attack
From: Allen M (ajmiyake_at_yahoo.com)
Date: 03/21/05
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Date: Mon, 21 Mar 2005 15:55:55 -0800
Here's a neat little trick I picked up in this NG. Create a Distribution
List for those email addresses. Do not add any members. Examples:
webmaster@mydomain.com admin@mydomain.com to name a few. Now whenever some
sends an email to these addresses it does not get a NDR because it really
hasn't failed to send. Instead it just sort of floats out there in cyber
space before the connection is dropped.
"Stan" <NONE> wrote in message news:ew0bGTmLFHA.2736@TK2MSFTNGP09.phx.gbl...
> Hello All:
>
> I'm see alot of mail being sent to past, present and non-existent users in
> my domain. I understand that this is a common practice of spammers to
> monitor the bounces etc to determine what are and are not valid email
> addresses...I guess to harvest the good ones. I'm running Exchang 5.5
> which is very limited in it's defense capabilities. My question is how can
> I eliminate these attacks...whether natively in Exchange or 3rd party
> software....any suggestions appreciated.
>
> STAN
>
- Next message: Alex Hoare: "Re: Everone has Read permissions on Mailboxs"
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