In this example all the mailboxes will share the same spam database.
In the Mailtraq Console, choose Options | Bayesian Anti-spam.
Choose the option marked 'Use a Shared Database for all Mailboxes'.
Then click the 'Tools' button.
Select the option marked 'Assign System Profile to all Primary Mailboxes'.
Then 'OK' to confirm your choices
The suggested settings are conservative and cannot result in the loss of email: IMAP & WebMail spam is sent to the 'Junk Mail' folder for inspection. POP3 mail is simply 'flagged' as spam so that you can use the filters in your email client to divert the messages.
The Mailtraq Bayesian Anti-spam system can also be set to deal with spam more aggressively and you can tune the system on a per user basis - you will find details in the contextual help within the dialog boxes.
If you are worried about losing mail as you first set up the system, you could create a new user and mailbox to try out all the settings on. Once you are comfortable with the concepts you can then set it system wide.
If you do this, you will need to feed the mailbox with inbound mail to analyse. A quick way to do this is to add Aliases on the mailbox properties matching the names of other mailboxes. The new mailbox will then receive a copy of their mail.