postfix with dovecot and mysql issue-Collection of common programming errors

I have been trying to install on ubuntu 12.04(Server) an email server following this tutorial . After all I can send out but I’m having problems to receive mails on my virtual mailboxes created with postfixadmin. Each time the response what I get is:

Status: 5.1.1 Diagnostic-Code: X-Postfix; unknown user:”test”

or if I remove everything from mydestination postfix main.cf

The error that the other server returned was: 554

mail.log shows

Jan 23 21:40:43 h2004156 postfix/local[23697]: B7A0246CE83F: to=, relay=local, delay=0.15, delays=0.12/0.01/0/0.02, dsn=5.1.1, status=bounced (unknown user: "test")

21:41:47 h2004156 postfix/smtpd[23857]: NOQUEUE: reject: RCPT from mail-bk0-f41.google.com[209.85.214.41]: 554 5.7.1 : Relay access denied; from= to= proto=ESMTP helo=