https://roundcube.net/screens/ http://dietpi.com/phpbb/viewtopic.php?f=12&t=1828#p7022 https://github.com/roundcube/roundcubemail
https://www.rainloop.net/ has also been proposed.
+1 RainLoop
General Cleanup: Marking all software requests as closed. Once interest peaks, we'll reopen once work starts.
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https://www.rainloop.net/ has also been proposed.