Does the following http://www.postfix.org/CONNECTION_CACHE_README.html
apply to : When postfix sents a RSET smtp command, and delivers a new mail using the same connection ? I understand that by default it will use smtp_connection_cache_on_demand on a high queue (what number exactly?). However, i would like to disable this for local filters (anti/spam/virus) because sometimes they may get confused and do not support this behaviour. It should still be active when sending to the next hop. Thanks