kar...@mailcan.com:
>
>
> On Fri, Apr 27, 2012, at 05:23 PM, Jim Reid wrote:
> > The info will already be cached at your local DNS server. So you've
> snip.
>
> Nicely explained.
>
> > My advice is to leave this alone. It's already working at maximum
> > efficiency pretty much straight out of the box and there are no
> > meaningful postfix (or DNS) configuration tweaks which could make
> > things even faster.
>
> I'd still think that a local check by Postfix to an 'auto-expiring hash
> table' (unclear so far it that can be done) to which the 'bad' address
Each Postfix SMTP server caches its own DNSBL lookup results. Those
results are not shared with other Postfix processes.
The in-process cache saves time when one message has multiple
recipients, and the DNSBL check is done once per recipient in
smtpd_recipient_restrictions.
Wietse
