Hello, I just spent a bit troubleshooting an installation of the roundcube ispconfig plugin. It all went pretty well up until trying to load it when I got a "failed to load /var/lib/roundcube/plugins/ispconfig3_account/ispconfig_account.php in /usr/share/roundcube/program/lib/Roundcube/rcube_plugin_api.php on line 224" I had followed the instructions at https://github.com/w2c/ispconfig3_roundcube/wiki/Installation-Instructions-(manual) There is a missing step in the instructions that should say something about creating the symlinks in /var/lib/roundcube/plugins/ folder. For example: cd /var/lib/roundcube/plugins ln -s /usr/share/roundcube/plugins/ispconfig3_account ispconfig_account This needs to be done for each plugin. Just thought you should know.
depending on your OS and web server, you might find better instructions with one of: https://www.howtoforge.com/using-roundcube-webmail-with-ispconfig-3-on-debian-wheezy-apache2 https://www.howtoforge.com/using-roundcube-webmail-with-ispconfig-3-on-debian-wheezy-nginx https://www.howtoforge.com/tutorial/roundcube-installation-on-debian-8-jessie/ (Note to @till or whomever: that last tutorial needs a link on the http://www.ispconfig.org/documentation/ page.)
@Jesse Norell: Thanks for the notice, I'll add the link. Seems as if I lost it during recent ispconfig.org website update.