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Setup:
* Update to Roundcube 1.3.8 and the CardDAV plugin to 3.0.3.
* Add missing rsyslog package to install line since some OS images don't have it installed by default.
* A log file for nsd was added.
Control Panel:
* The users page now documents that passwords should only have ASCII characters to prevent character encoding mismaches between clients and the server.
* The users page no longer shows user mailbox sizes because this was extremely slow for very large mailboxes.
* The Mail-in-a-Box version is now shown in the system status checks even when the new-version check is disabled.
* The alises page now warns that alises should not be used to forward mail off of the box. Mail filters within Roundcube are better for that.
* The explanation of greylisting has been improved.
