Not detecting some instances of viruses

[Alex Neuman]

Jon Bates wrote:
> I'm having trouble whereby only SOME instances of the same virus are being
> identified by ClamAV.
>
> The virus is exactly the same type every time, but only some get detected -
> the rest are sent on to the user!
>
> There is no pattern that I can see - Zip files (containing infected exe),
> and plain exe files have been allowed through.
>
> I've subsequently scanned the users mailbox on the server using clamscan,
> and it DOES detect the email! For some reason, when it is scanned when the
> message is received, it's not detected. 
>
> Any help would be appreciated!
>
> - Jon Bates
>
>   
You shouldn't be allowing EXEs in the first place, I think.