Re: Random addresses answering TMDA Queries

[Brian E Carpenter <brian.e.carpenter at gmail.com>]

On 2007-10-03 14:14, John Levine wrote:
> > The Secretariat tells me that Spammers are responding to TDMA
> > queries so that their mail goes through.  They have made the
> > suggestion that we clear the list of people once per year.
>
> Isn't there an engineering principle that if something is broken,
> you don't fix it by breaking it even worse?
>
> Naive challenge/response systems like TMDA never worked very well, 

John,

The IETF uses Spamassassin before mail ever hits TMDA, so most of
the readily detected junk never gets there. From the time I was
watching what was happening with TMDA at ietf.org, the problems
you describe just weren't happening; what was happening was that
literally 99% of the spam that survived Spamassassin was getting
caught. That's a serious estimate from the impact of TMDA on the
IESG list. The chain:

  Spamassassin -> TMDA -> mailman moderation

basically does the job just fine.

    Brian


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