root@ubuntu:~# postmap /etc/postfix/virtual_mailbox_domains
postmap: warning: /etc/postfix/main.cf, line 34: overriding earlier entry: myhostname=ubuntu.emcomputers-nj.com
postmap: warning: valid_hostname: invalid character 64(decimal): ubuntu@emcomputers-nj.com
postmap: fatal: file /etc/postfix/main.cf: parameter myhostname: bad parameter value: ubuntu@emcomputers-nj.com
root@ubuntu:~#