Ok, before you move any further, you have to get mailscanner working properly.
Please double check the mailscanner section and read through everything to make sure you haven't missed anything. I got a feeling you missed the permission section. Also, make sure you have the startup file properly setup. Are you using windows to setup your box or ssh?
About gdebi, I forgot to put it in the dependencies section, but I updated it. You should install gdebi-core. We have to use gdebi because it installs the dependencies for Baruwa.
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