We often require notification and alerts from system to update/send. Recently I faced issue with a program sending email from linux(CentOS) which used postfix to relay emails, however it has security issues but as it was being used in a closed environment. After doing required standard configuration on postfix I faced following errors in maillog:

 /etc/postfix/main.cf: Permission denied

I looked it up and got fixed after following command:

restorecon -r /etc/postfix

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