DA comes with SpamBlocker and with SpamAssassin, but not with any anti-virus solution.
See these forums for information on SpamBlocker and on SpamAssassin. You should probably update to SpamBlocker Version 2 if your server isn't using it yet, as SpamBlocker Version 1 whitelisting didn't work consistently.
You can find posts on these forums for anti-virus solutions; none of them are inherently compatible with SpamBlocker.
We'll be releasing a free and open-source VirusBlocker solution for DA early in the new year.
Jeff