Looks like the install was not 100% successful. It probably didn't create 'postfix' user.
Try these:
grep postfix /etc/passwd
grep postfix /etc/group
grep postfix /etc/shadow
Do these show the user/group?
__________________ Regards,
Chintan Zaveri
(Yet another ZIMBRAN!)
"Dhundhne par Bhagwan bhi ..." 
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