Snoplow… if you get any problem and your computer start to send, without your knowledge and willing, spams (or infected mail), you can ‘see’ what’s wrong if you scan your outbound mail. You’ll make your friends and any other who receive your mail happier 8)
See examples:
http://forum.avast.com/index.php?topic=25768.msg210446#msg210446
http://forum.avast.com/index.php?topic=26030.msg212841#msg212841
http://forum.avast.com/index.php?topic=23621.msg194938#msg194938
http://forum.avast.com/index.php?topic=23388.msg192933#msg192933