Attachment size problem

hello,

on my system there is a RC, with PHP 4.3.11.

In php.ini, there are these options:

file_uploads = On upload_max_filesize = 10M

when i want to send a mail with a more bigger attachment, i get this error (at this time i try with 2.9MB):

Warning: rmdir(temp/229457485442309f8c01a8): Directory does not empty /usr/local/rcmail/program/steps/mail/func.inc on line 1384.

The mail was sended, but recipient doesn't get the attachment.

In that directory, there is this structure: $RCROOT/temp/229457485442309f8c01a8/rcmAttmntZx7bFv

but file is empty (0 byte length).

what may be the problem?

thanks:

a.