DN Singh:
> Hello group,
> While implementing our own DNSBL, I came across a phenomenon. Right now in
> testing phase, I found that the dns queries were being cached in postfix
> itself. I had made some changes in the dns side, and wanted them to be
> reflected on the mta.
A Postfix SMTP daemon caches successful DNS[BW]L lookup results
TEMPORARILY in its own memory. It terminates after being idle for
$max_idle seconds (default 100), after serving $max_use clients
(default: 100), or after "postfix reload".
The postscreen daemon does not cache DNS lookup results. Instead,
it saves its whitelisting decisions to a persistent database.
Wietse
