What’s your ISP, and what’s your e-mail provider name ? If you don’t know, ask them does your e-mail uses SSL (Secure Socket Layer) connections ? If it does, you have to be aware that avast! doesn’t support SSL connections for now… in future maybe, but for now it doesn’t.

We should wait for respond from someone from Alwil staff to see is there any workaround for this…

Cheers !