How to Enable RSS Syndication in Plone
Plone can generate an RSS feed for data in a folder. This document shows you how.
Enable Syndication
By default the form to allow RSS syndication is hidden. To get to the form that allows RSS syndication you should browse to the folder with the news items. Then, add synPropertiesForm to the end of the folder's url to gain access to the RSS Syndication Form. Once on that page just click the Enable Syndication button.
Set Update Frequency
This will display another form that allows you to modify the update frequency for the feed. To prevent overloading the server you might consider keeping a daily update frequency.
ZMI Settings
You may also need to change settings in the ZMI. Log in to the ZMI as an administrator and go to portal_syndication. You can change settings like the URL used to access the form, etc.