Glad to hear that you're attempting to use the SpamSnake. You have to make sure that you have the proper DNS entries (MX) setup for your configuration pointing to the SpamSnake. After that, mails should hit the SpamSnake and should be accepted.
In your transport table, list your MTA's IP address, following the instructions. Emails should start going to your scalix box from the spamsnake. You might have to setup your scalix system to allow your SpamSnake to send emails to it.
For outgoing emails, add your scalix system IP address in /etc/postfix/main.cf under mynetworks. Setup your scalix system to use the SpamSnake as a smarthost and you should be all set.
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