Folks -
I've made a change to the configuration of the ILUG mail server (dagda)
in that it now implements greylisting. Greylisting of incoming mail
basically means that, on the first attempt to send a mail to dagda, the
mail will be refused with a 450 (temporary error), but will be accepted
should it be resent after five minutes. This actually traps quite a
lot of spam, as most spammers don't bother to resend email.
This should actually reduce the load on dagda, as less mail will make
it through to the SpamAssassin stage of the filtering (SA is pretty
resource-hungry).
The visible result will be that mail takes longer to reach the list,
probably about 15 minutes or so, depending on how other MTAs are
configured.
I'd like to run with this solution for a few weeks; if it seems to
reduce the volume of spam being processed by dagda, and the change
doesn't have too many adverse effects, I'll make it permanent.
Please let me know ASAP if you notice your email actually bouncing.
Colm
--
Colm Buckley / colm at tuatha.org / +353 87 2469146 / www.colm.buckley.name
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