Block downloads from Hotmail / Gmail using ISA 2004 HTTP Filter

[rinseit]

Hi,

Am trying to use the http filtering in ISA 2004 to block downloads from webmail (notably yahoo, gmail and hotmail). The http filter is successfully blocking downloads based on file extensions from most sites, but presumably because of the way the webmail sites work, ISA is not recognising the download request and therefore users are still able to download files from their e-mails.

Any help gratefully appreciated..

Thanks

Will