Kmail Error

Hello! I've created a symbolic link from my network drive to the /home/mail directory (This is where Kmail normally stores it's mail). I'm trying to be able to backup the mail directory from the network. However, when I try to compose a new message I get the following error: KMail encountered a fatal error and will terminate now The error was: Not enough free disk space Two things I've checked 1. There is enough disk space on the network drive 2. There are sufficient rights (at least what I checked) Any thoughts on why Kmail would do this? Thanks, Jon