It doesn't seem to work.
I've tried with:
to "|/usr/bin/php -q /var/clients/client1/web1/.filter.php"
but the email continues to be inserted into the mailbox.
This script simply creates a file, and if I execute it by hand it does it, but not when an email arrives.
Maybe I should look at the mail log ? (where is it?)
or maybe I should verify if ispconfig really creates the dropmail filter, since version 3 is not completely stable??