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Article: 1055
From: Sebastian Hagedorn
Date: 2006-07-20 03:12:48 -0400
Subject: Re: Experiences with caching and milter-ahead

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--On 19. Juli 2006 20:06:30 +0300 Panagiotis Christias=20
<christias@gmail.com> wrote:

> No cache corruption problems here too, although our setup (National
> Technical University of Athens, Greece) is quite smaller, less than
> one hundred messages per day.

Lucky you ... :-)

> Regarding the cache TTL, we are quite conservative. Currently, we have
> set cache-reject-ttl to 10 minutes and cache-accept-ttl to 3 days. Our
> cache hit ratio, calculated on a daily basis, is around 40%; good
> enough I think.

Thanks, that's good to know. I've decreased our reject-ttl to one hour, but =

I've left the accept-ttl at its default of one week. The way I see it a=20
false positive doesn't do that much harm, i.e. if a previously valid=20
address has been disabled in the meantime it might cause a few backscatter=20
bounces, but that seems acceptable to me.
     .:.Sebastian Hagedorn - RZKR-R1 (Geb=E4ude 52), Zimmer 18.:.
Zentrum f=FCr angewandte Informatik - Universit=E4tsweiter Service RRZK
.:.Universit=E4t zu K=F6ln / Cologne University - Tel. +49-221-478-5587.:.
                   .:.:.:.Skype: shagedorn.:.:.:.
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