How change SELinux context for postfix file on Fedora 20

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In a general way,the permissive mode associated to auditd logs (/var/log/audit/audit.log) will allow you to understand what rule is being violated and possibly create custom rules to allow specific acess for a process on an object type. You may find interesting input for this in this doc: https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/Security-Enhanced_Linux . Tools you may need to learn are for example audit2allow. An important point is to first understand the root cause of SElinux denial, and what you open when adding custom rules. The permissive mode is no bad in itself it you take car of analysing the logs.