Antivirus problem

[primoco]

Hi, i have upgraded from 7.0 to 7.5.2 plesk for windows, i have DrWeb and mailenable standard on my server but all virus came without problem. Seams that plesk don't filter the messages, I have installed also clamav with the same results.
Can anyone help me?
Thanks.

 

[primoco]

Seams that the virus came randomly, some identical virus came and other don't came.
Any ideas?