df show's
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/main-root
75732080 71884948 172 100% /
/dev/md1 101018 19240 76562 21% /boot
none 256888 0 256888 0% /dev/shm
[root@mumbles ~]#
I guess it thinks the hard drive us still full, although we have deleted at least 8,000 emails and 2Gb's worth of data.
I'm awaiting the correct message from those on site regarding what Thunderbird reports.