Using 'nolisting' to reduce spam

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Using 'nolisting' to reduce spam
\ Glen Eustace (16 Jan 2008)
. \ postfix (16 Jan 2008)
. \ Jorey Bump (16 Jan 2008)
. . \ Robert Schetterer (16 Jan 2008)
. . . \ mouss (17 Jan 2008)

1 msg	mail priority by sender

Subject:	Using 'nolisting' to reduce spam
Group:	Postfix-users
From:	Glen Eustace
Date:	16 Jan 2008

I noted with interest a reference to 'nolosting' on this list the other
day. This wasn't a technique I was aware of. It doesn't seem to be a
very well understood technique here in NZ and hence would not appear to
be very widely used. A number of comments I have received indicated that
it would adversely effect traffic and that the proportion of primary MX
only spam bots is not high and that a significantly larger proportion
just hit the secondary MX.

My initial implementation would seem to suggest that it is still worth
doing. I was wondering if there are any statistics or imperical evidence
to support my observation or any other comments as to the
usefulness/value of using the technique ( in addition to all the other
things like RBLS, GreyListing, Checking Recipients, Spamassassin etc.

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