To protect your Outlook Express, Thunderbird, Mozilla Mail, etc, you need to install “E-mail Provider Protection”.
And ADD/REMOVE Programas, click in avast, remove, after, click to add others functions and select the email protection (no ms exchange)
Starting in Avast 4.5, after instalation the provider, not is necessary configurantions, its already to protect.

Goodbye, and sorry, because i’m Brazilian and my english…bad…