I followed the instructions step by step and when I typed "postfix reload" at the end it says: "[root@server1 postfix]# postfix reload postfix: fatal: /etc/postfix/postfix-script: Permission denied" main.cf: myhostname = localhost virtual_mailbox_domains = /etc/postfix/vhosts.txt virtual_mailbox_base = /var/spool/mail/ virtual_mailbox_maps = hash:/etc/postfix/vmaps.txt virtual_uid_maps = static:5000 virtual_gid_maps = static:5000 virtual_alias_maps = hash:/etc/postfix/valias.txt