SquirrelMail inbox blank, emails not being stored correctly

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http://serverfault.com – I'm trying to set up a mail server on an Amazon EC2 Micro instance - following this post by flurdy. I've installed Postfix, Courier IMAP and Squirrel Mail. I've been testing the ability to send and receive emails via postfix - and this is working fine. I've connected to SquirrelMail succesfully - however the inbox is blank. It appears the email files are being created at /var/spool/mail/myuser as opposed to /var/spool/mail/virtual/myuser. At first I couldn't connect to SquirrelMail - because the myuser directory wasn't initiated within virtual/. So I manually added this via maildirmake myu (HowTos)