Redhat linux as5.3 postfix

shenkangxyz

[root@localhost shenkang]# rpm -ivh postfix-2.3.3-2.1.el5_2.i386.rpm
warning: postfix-2.3.3-2.1.el5_2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 3701
Preparing...                ########################################### [100%]
   1:postfix                warning: group postdrop does not exist - using root
warning: group postdrop does not exist - using root
warning: user postfix does not exist - using root)
warning: user postfix does not exist - using root
warning: user postfix does not exist - using root
warning: user postfix does not exist - using root
warning: user postfix does not exist - using root
warning: user postfix does not exist - using root
warning: user postfix does not exist - using root
warning: user postfix does not exist - using root
warning: user postfix does not exist - using root
warning: group postdrop does not exist - using root
warning: user postfix does not exist - using root
warning: user postfix does not exist - using root
warning: group postdrop does not exist - using root
warning: user postfix does not exist - using root
warning: user postfix does not exist - using root
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postfix: fatal: file /etc/postfix/main.cf: parameter mail_owner: unknown user name val