how to solve postfix errors?

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http://unix.stackexchange.com – After following several tutorials on setting up postfix at basic level on CentOs for my VPS, continue to get the following: -bash-4.1# postfix start /usr/libexec/postfix/postfix-script: line 317: cmp: command not found postfix/postfix-script: warning: /usr/lib/sendmail and /usr/sbin/sendmail differ postfix/postfix-script: warning: Replace one by a symbolic link to the other postfix/postfix-script: starting the Postfix mail system In the main.cf below are my edits: myhostname = myservername.sub.mysite.net mydomain = sub.mysite.net myorigin = $myhostname myorigin = $mydomai (HowTos)