The Internet Mail Clients supported are: MS Outlook (including Outlook 2003), MS Exchange, MS Outlook Express, Eudora, Pegasus Mail, Netscape Mail, Mozilla Mail, IncrediMail and The Bat!

Don’t forget Opera’s M2… ;D

Is there any way I can be sure Avast is checking my mail?

on the internet email provider check mark “insert note into clean message” for POP, SMTP and/or IMAP… Hope thats what your looking for…