Public Frontend Plugin
This plugin enables "Public Frontend" functionality. When you enable the Public Frontend
unregistered users can send PMs to registered users.

Message Report Control Center
This plugin enables the "Report message" feature, so users can report messages (e.g. SPAM)
to the Admin. In the backend the Admin can check all reported messages and take appropriate
actions.

File attachments
This plugin enables file attachments in uddeIM, so users can send files to each other.
It is highly configurable, so admins can specify the allowed attachment size and what groups
are allowed to send file attachments. Note that the Public Frontend Plugin does not support
file attachments because of security reasons.

RSS Message Feed Plugin
This plugin publishes your inbox using a RSS feed. So you can display PMs in your favorite
RSS reader or on your personalized iGoogle page. There is also an (unsupported) iGoogle gadget
available which shows the content of the inbox (you can use any RSS gadget you like).

You will find more information about these plugins in the FAQ section 3.