I've noticed that during the install when ISPConfig configures and restarts services, Dovecot seems to not get configured correctly (at least not for me). Code: ... Stopping Dovecot Imap: [FAILED] Error: mail_plugin_dir: Can't access directory: /usr/lib/dovecot/imap/: No such file or directory Fatal: Invalid configuration in /etc/dovecot.conf Starting Dovecot Imap: [FAILED] Stopping httpd: [ OK ] httpd: Could not reliably determine the server's fully qualified domain name, using server1.cfcoding.com for ServerName [Sun Mar 14 19:11:41 2010] [warn] NameVirtualHost *:80 has no VirtualHosts Starting httpd: [ OK ] Stopping pure-ftpd: [ OK ] Starting pure-ftpd: [ OK ] Installation completed. [root@server1 install]# The plugin directory is /usr/lib64/dovecot/[imap|pop3|...] I currently have Dovecot set to not start with the system as it should be using Courier instead so I don't think this is an issue for me. However, when trying to view mail for "root" at http://192.168.1.151/webmail/, after logging in I get ERROR: Connection dropped by IMAP server. I'm not sure if this error is related to Dovecot or Courier...?