bugtraq - Re: Is predictable spam filtering a vulnerability?

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Message-ID: <40D38D99.8090903@cwru.edu>
Date: Fri, 18 Jun 2004 19:49:29 -0500
From: Jon Fiedler <jmf9@...u.edu>
To: dfs@...ringpenguin.com
Cc: bugtraq@...urityfocus.com
Subject: Re: Is predictable spam filtering a vulnerability?

David F. Skoll wrote:

>On Wed, 16 Jun 2004, R Armiento wrote:
>
>  
>
>>However, 'C':s spam filter silently drops the email.
>>    
>>
>
>In my opinion, any spam filter that silently drops e-mail is broken, and
>is indeed a security risk.  A spam filter MUST respond with a 500 SMTP
>failure code if it rejects a message.
>
>Regards,
>
>David.
>  
>
This ignores client side spam filters, and doesn't really change the 
attack.  The 500 message would be sent back to A, but not B, so B is 
still in the dark about C not receiving the emails.

jon