How can you use your spam killer at a different port of your email client?
I presume they are not integrated…
I suggest you disable 1st EAV for a while and configure your system to use just the email program + spam killer + avast as stated above. You can let the default configurations at avast4.ini file.
After you got avast scanning your mail, then let’s try to help you with the 1st EAV… :