Ok here is what i've done
I sent an email to the admin account on the server, it has recive the mail by the looks of it
I now have a /home/admin/Maildir
When using Evolution to contect I recive this message
Error while Fetching Mail.
Could not connect to rockinghamgateway.com: No route to host
Now when i followed the 2nd step you pointed me too I added a user called tommytomato, I sent an email to the so call address and that bonced back, Evolution mail gives me this message on the bottom
From: Mail Delivery System <MAILER-DAEMON@rockinghamgateway.com>
This is the Postfix program at host rockinghamgateway.com.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The Postfix program
<email@example.com>: maildir delivery failed: create
So I'm not sure on whats going on there, but I think its the way the user was added, admin was added when I did the install and the tommytomato was added when I typed in
useradd -d /home/tommytomato -g users tommytomato