Have you already used autoreply before? If not read the "first time howto".

Log into the shell of the dega server with putty or similar applications. Use you own username and type in the password after the prompt asks for it. The domain you have to use is

dega-akustik.de

You are now in your own home folder. Type in the following command:

echo "|/usr/bin/vacation -a $USER@dega-akustik.de $USER" > .forward

Change your message file if you want:

nano .vacation.msg

You save to file with "CTRL+O" and you quit nano with "CTRL+X".
Now tell vacation you have changed something by executing

vacation -I

Nice vacations!