I found this in the apache2 error logs.
[Sun Nov 11 15:27:16 2012] [error] [client 192.168.1.101] PHP Warning: file_exists(): Fopen_basedir restriction in effect.File(/var/spool/squirrelmail/attach/kGbuxfcRnU3vd6VeCMuI1CzkqLzYJM2Q) is not within the allowed path(s): (/usr/share/squirrelmail:/etc/squirrelmail:/var/lib/squirrelmail:/etc/hostname:/etc/mailname) in /usr/share/squirrelmail/src/compose.php on line 1464, referer:
http://192.168.1.105/webmail/src/com...startMessage=1
I found the solution here.
http://www.howtoforge.com/forums/arc...p/t-55043.html
and its fixed.