I only set up the server a couple of months ago and just use it for my own company websites:
Filesystem Size Used Avail Use% Mounted on
/dev/hda1 7.4G 2.0G 5.1G 28% /
tmpfs 189M 0 189M 0% /lib/init/rw
udev 10M 68K 10M 1% /dev
tmpfs 189M 0 189M 0% /dev/shm
/dev/sda1 4.3G 137M 3.9G 4% /data1
/dev/sda2 4.2G 137M 3.9G 4% /data2
The actual installation is Debian Etch from your howto and ISPConfig - that's all. Apart from regualr apt-get upgrades and updating ISPConfig I have done nothing else with the back end. The front end sites are running Joomla that's the lot.
THis is not some odd permissions problem, or perhaps the adminmail.txt is corrupted?
If I run the command direct I get:
server2:~# cat /home/admispconfig/ispconfig/adminmail.txt
SHould it look like that, with "root@localhostserver2:~#" all on one line?
By the way. I have noticed that I get the same error come up if I log into webmail. THe webmail does display but the error is across the top of the page.