Where must i install this app (i 'm trying to configure mail3 server)? - on web3 - on mail3 i have installed on mailserver ... but this install Apache too !!!!!!!!!!! so forced to run php -q update.sh ... then actived web server then got a beautifull : Sep 05 09:32:12 mail3 apachectl: AH00526: Syntax error on line 60 of /etc/apache2/sites-enabled/000-apps.vhost: Sep 05 09:32:12 mail3 apachectl: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included in the server configuration Sep 05 09:32:12 mail3 apachectl: Action 'start' failed. Edit : i don't know what ISPconfig is doing on mailserver ... with Apache , Rewriting stuff, changing listening port from nothing to 8081 (few second later) , break rspamd listening on 11334... this IS NOT very clear for me. Our setup web1-3, mail1-3, db1-3,ns1-2 ... multiserver ! Note : Multi server setup is very painfull ;-), no doubt.