Do you have a router? What firewall are you using? AshMaiSv.exe is the Internet Mail Provider, and only listens on your Avast! proxy ports for inbound connection requests, makes outbound connections to the internet on your mail ports (usually 25, 110) at your mail server's IP address. So don't know how your firewall could have decided the destination was AshMaiSv.exe from that port number and IP address.