Trying to prevent large file attachments in Squirrelmail, on U8.10S.

[Xn Nooby]

Is it possible to prevent Squirrelmail users from uploading large
files to a server running Squirrelmail?  My testing seems to indicate
that the attachment size limits enforced by Squirrelmail take place
*after* the file has been uploaded - at which time Squirrelmail aborts
the entire message. I will have some remote users, and I do not want
them to be able to upload files that are over a limit (say 10MB).

If a remote user tries to attach a 500MB attachment to their email, I
don't want them to upload the entire 500MB file, only to then have SM
abort the message.  I want it to fail immediately, or after the 10MB
limit has been reached.

I though there was a way to do this in Apache or PHP, but have been
unable to find it.  I am running Ubuntu Server 8.10 with Apache,
Postfix, Dovecot, and Squirrelmail.

Any suggestions on how to get the file attaching process to abort
before it uploads the entire 500MB file?

thanks!