yes, you can ... can't say where exactly (am at work without Avast) but it is configurable.
looks like this :
avast! Antivirus: Outbound message clean.
Virus Database (VPS): 0431-0, 26/07/2004
Tested on: 7/28/2004 12:23:52 PM
avast! - copyright (c) 2000-2004 ALWIL Software.
http://www.avast.comedit : using the Home Edition ...