REDDOXX MailDepot 2032 2.2.1242 allows authenticated users to access the mailboxes of other users.
https://www.syss.de/pentest-blog/
https://www.reddoxx.com/en/products/archiving/
http://packetstormsecurity.com/files/159455/MailDepot-2032-SP2-2.2.1242-Authorization-Bypass.html