switch from dovecot to courier - possible? I am running a ISPConfig3 v. 18.104.22.168 on Debian 6 with Apache and BIND (plus dovecot), installed using Falko's perfect server how-to. Now I have the problem that dovecot makes it difficult to manipulate autoresponder messages by script, so I want to switch the mailserver to courier. Is this possible on a running server? is this as easy as removing dovecot packages and installing courier or will this break ISPC3 functionality? I also have squirrelmail installed, but I guess that one will be easy to rewire onto courier by simply reconfiguring it. correct?