If you experience this error, you will need to import the GPG key(s); follow these instructions to do that:

1) Login to your Linux box via SSH as root.

2) Run the following command:

rpm –import http://anorien.csc.warwick.ac.uk/mirrors/centos/3.5/os/i386/RPM-GPG-KEY-CentOS-3

That should be the problem solved!

Follow these steps to install cPanel on a Linux box.

1) Login to your Linux machine via SSH as root.

2) Run the following commands:

# cd /home

# wget http://layer1.cpanel.net/latest

# sh latest

After that you will need to leave it for around 90 minutes so that cPanel can install.

Installing Fantastico on a Linux system is fairly easy; follow these instructions and you will have it installed in no time!

1) Login to your Linux box via SSH as root.

2) Run the following commands:

# cd /usr/local/cpanel/whostmgr/docroot/cgi

# wget -N http://files.betaservant.com/files/free/fantastico_whm_admin.tgz

# tar -xzpf fantastico_whm_admin.tgz

# rm -rf fantastico_whm_admin.tgz

3) Login to WHM and navigate to: ‘WHM’ > ‘Add-Ons’ > ‘Fantastico De Luxe WHM Admin’ and perform the rest of the installation from there.

You have just install Fantastico!

You may find that your FLV videos aren’t playing or won’t download. To solve this you will need to add the FLV mime type in IIS. To do this, follow these instructions:

1) Select the site which you want to configure in IIS; right click on it and select ‘Properties’.

2) Under the ‘HTTP Headers’ tab, select “File Types” under the ‘MIME Map’ section and select ‘New Type’.

3) Type ‘.flv’ as the associated extension, and ‘video/x-flv’ as the associated content type.

4) Click ‘OK’, then restart IIS.

That’s it! Your FLV files should now play and download!

To restart cPanel, login via SSH and run the following command:

/etc/init.d/cpanel restart

Here are some handy commands to help debug exim:
exim -bp - Show what is currently in the mail queue
exim -qf - Force delivery off everything that is in the mail queue
tail -f /var/log/exim_mainlog - See what exim is doing. Its also worth checking /var/log/exim_paniclog