Trying to prevent large file attachments in Squirrelmail, on U8.10S, is this a PHP issue?

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I am using PHP5 on Ubuntu 8.10 Server, it is being used by Apache and
Squirrelmail. I have tried setting the upload_max_filesize in the
/etc/php5/apache2/php.ini file, but it only seems to apply after I
upload the file. My goal is to prevent remote Squirrelmail users from
attaching large files to the emails they are drafting. They have slow
connections, and uploading a large file would effectively hang them.


Here is my question originally posted to the Ubuntu Forum (before I
began understand it was possibly a PHP issue):


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!

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