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RE: Spammers answering TMDA Queries

2007-10-04 12:39:13
Absolutely, and in fact I see mailing list management as a natural early 
adopter for DKIM filtering.

The vast bulk of the spam I am moderating off the KEYPROV list is phishing spam 
against five particular addresses, all of which implement DKIM. My workload as 
a moderator can be cut by 80% by rejecting any message from those addresses 
that is not DKIM signed.

Mailing lists do not in general subscribe to mailing lists so the normal 
arguments against discarding messages for failing DKIM compliance do not apply. 

-----Original Message-----
From: Fred Baker [mailto:fred(_at_)cisco(_dot_)com] 
Sent: Thursday, October 04, 2007 1:44 PM
To: Hallam-Baker, Phillip
Cc: John Levine; ietf(_at_)ietf(_dot_)org
Subject: Re: Spammers answering TMDA Queries

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On Oct 4, 2007, at 11:56 AM, Hallam-Baker, Phillip wrote:

The problem is the amount of time it is taking to moderate 
mail sent 
by non subscribers.

yes. For example, every email from @cisco.com is dkim-signed. 
The IETF can automagically dump any such email that is not 
signed, or for which the signature doesn't check out. I know 
that fred(_at_)cisco(_dot_)com is one of many commonly-spoofed email 
addresses - I can tell that from the backscatter I find in my 
junk box.

For how many of us is that true?
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