Can i get the reply for this

was just looking at a thread and looks like someone was working on this,

http://forums.bluecoat.com/viewtopic.php?f=1&t=6665

Best,

will this configuration wokrs on Bluecoat 800 series devices

will it block only on webmail traffic. I want to block attachment to any website via http & https.
Apart from webmail there are many other websites by which we can upload documents,
I want to block those also.

I don't think it's possible, you can try, but I'm sure some attachments have to be sent sometime by your users to someone outside the company just in the course of normal business. Not only could someone use BT, FTP, HTTP or HTTPS but often sites have applets written in java/flash or other that allows an upload over other protocols. Instant messengers, smart phones that can check the users email or even VPN into your lan. Usb drives, cd-r's, laptops ... a web mail for you users... someone RDP'ing home, someone ssh'ing home and copying files over scp...
What are you really trying to prevent? Company secrets from leaving? Users from using unauthorized software? Perhaps there is an easier, and or more enforceable way.
-rich

is there any document from bluecoat regarding this

What are you really trying to prevent? Company secrets from leaving? Users from using unauthorized software? Perhaps there is an easier, and or more enforceable way. As I listed above, there are thousands of ways to get files out to the internet, other computers and other devices like black-berry's, iPhones, Droids are becoming the thorn in my side because I cannot control what is on 3g networks.
-rich

I need to prevent users from sending or attaching any attachments using proxy to the internet.
No files can be uploaded to internt sites or through web based mail internet websites

I do understand the requirement for this type of thing although I agree it's impossible to design a fool-proof solution.

The 'closest' option I've been able to find is as follows:

define condition attachment
    request.header.Content-Type="multipart/form-data"
end condition attachment
;
<Proxy>
    condition=attachment http.method=POST force_deny

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