After some hours I have completed a initial RSS feed-creator for Roundcube. It is a simple addon which gives you a RSS feed of your inbox. Current problems:
resulting in strange HTML messages
found; but it results in being logged out if you request the RSS feed from another IP then where you started the session on.
performance
To try it:
your roundcubemail/program/steps/mail/ directory
compose entry from session") if ($_action=='rss') include('program/steps/mail/rss.inc');
That should do the trick; you can now browse to the following URL
http://your.roundcube.url/?_auth=leave_existing&_task=mail&_action=r...
Comments welcome :)
Regards, Sjon