so I manually modified main.cf, and made some progress in getting mailman to handle inbound mail to its addresses;
alias_maps = hash:/etc/aliases, hash:/etc/mailman/aliases
virtual_alias_maps = proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, mysql:/etc/postfix/mysql-virtual_email2email.cf, hash:/etc/mailman/virtual-mailman
will this modification survive upgrades to ispconfig? is there a different way postfix is informed of the list aliases created by mailman?