[SA-exim] memcached for greylisting

[Eduardo Diaz Comellas]

Hi!

In the exim users list it has been proposed to use memcached to store
some values. As memcached implements record expiry natively, and can be
easely shared in a network, it seems to be a great option for greylisting.

I've managed to hook Exim into memcached using ${readsocket}. There are
many useful applications for this. Its inbuilt ability to automatically
expire data after a time period would make it ideal for greylisting for
example.
https://secure.grepular.com/blog/index.php/2009/05/13/accessing-memcached-from-exim/
Ideally, Exim would have a native memcache interface letting you store
${memcache{set}{key}{value}{timeout}}
${memcached{get}{key}}
But my solution is just as functional (less pretty)

Regards

[Marc MERLIN]

Post by Eduardo Diaz Comellas
Hi!
In the exim users list it has been proposed to use memcached to store
some values. As memcached implements record expiry natively, and can be
easely shared in a network, it seems to be a great option for greylisting.

First, to be honest sa-exim more or less does what I wanted it to, and I
don't have the time nor desire to add lots of new features, especially since
most people seem to be using exiscan since it's good enough at what it does
spam-wise and built in exim.

Second, memcached doesn't survive a reboot from what I can tell. While there
isn't a compelling reason to change sa-exim's greylisting away from files on
disk that are easy to parse and manage, i also like the fact that I don't
lose the greylisting data if the server gets rebooted.

Marc

Post by Eduardo Diaz Comellas

I've managed to hook Exim into memcached using ${readsocket}. There are
many useful applications for this. Its inbuilt ability to automatically
expire data after a time period would make it ideal for greylisting for
example.
https://secure.grepular.com/blog/index.php/2009/05/13/accessing-memcached-from-exim/
Ideally, Exim would have a native memcache interface letting you store
${memcache{set}{key}{value}{timeout}}
${memcached{get}{key}}
But my solution is just as functional (less pretty)

Regards
--
Ultreia Comunicaciones S.L.
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