= Postfix/Memory_footprint_with_large_maps = From http://archives.neohapsis.com/archives/postfix/2009-10/0931.html ---- It turns out the dude's smtpd processes were getting huge, like 25MiB. {{{ The memory usage is caused by smtpd_recipient_restrictions = check_client_access cidr:/etc/postfix/dnswl/postfix-dnswl-header, check_client_access cidr:/etc/postfix/dnswl/postfix-dnswl-permit, This are whitelists downloaded from DNSWL every night. Each file is about 4 MBytes and bloats EACH smtpd-process by 10 MBytes. }}} Aha. From Victor: {{{ CIDR tables are held in memory. As Wietse mentions, you can use proxymap as a "shared-memory" cache for this. }}} You'll have to add `smtpd_recipient_restrictions` or `check_client_access` to the list of Postconf:proxy_read_maps, I'm not sure which is correct.