Compliance Accelerator - filtering out SPAM solution

Hi

EV 9.0.2 and 10.0.4

I need a solution to filter out SPAM in CA.

I understand there are 3rd party solution, or custom filtering can be used, or DCS, etc.

A novel proposal is to use the Outlook Rules Wizard to delete SPAM as they arrive into the journal mailbox.

Is this a supported configuration? Seems at face value it would work.

According to MS, the rules size limit for mailboxes in Exchange Server 2007 (and later) has a default size of 64 KB per mailbox. The total rules size limit is also customizable limit up to 256 KB per mailbox. As long as we stick to these limits, should be OK?

thanks