lukor
2
Why don’t you provide us with some specific info. Firstly what is your account settings in Outlook Express? With k9, your POP3 server should be 127.0.0.1, port: 9999 - unless you have configured K9 diferently. Have you read other topics about mail scanning here in the forum? Mail scanning is now performed automaticly on all connections leaving your PC, in your situation that would be even before K9 gets the mail.
You might also find some answers by searching the forum for K9 keyword. Eg. here: http://forum.avast.com/index.php?board=11;action=display;threadid=8070
Lukas