Seems you have more to learn then. Pegasus isn't subject to malware in
messages, and it doesn't allow you to Run file attackments. It's
perfectly safe to use out of the box. There's no way you can get
infected while using it. And no need for antivirus software while
using it.
You can Save attackments to a download folder and scan them on-demand
if you wish, but most email attachments from unsolicited sources
should simply be deleted. That's all there is to it. No need for
realtime antivirus at all.
Frankly, it's absurd to use either Outbreak or Outlook Depressed when
there are excellent and free alternatives which have been designed
with security in mind.
It's a similar situation with browsers. Eradicating IE (except for
unfortunate Win XP users) is the single most important thing a user
can do. Far more important than using alleged software "protection".
Art
http://www.epix.net/~artnpeg