From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Wed Apr 18 2007 - 13:34:35 CDT

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On Wed, Apr 18, 2007 at 11:31:01AM -0700, Ed Sawicki wrote:

> I regularly receive spam from hosts that have already
> been added to the RBL/DNSBLs that my Postfix is
> configured to check. I see from the source that Postfix
> caches positive and negative RBL results.
>
> How long before results are aged out of the cache?

100 consecutive connections to a single smtpd(8) server.

    http://www.postfix.org/postconf.5.html#max_use
    http://www.postfix.org/postconf.5.html#max_idle

the cache is not global, it is per-process.

> Does reloading Postfix with the "postfix reload" command
> clear the cache?

Yes, but this is in practice never necessary.

--
        Viktor.

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