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Added note about expected error message from postfix.
systemctl start postfix.service
systemctl enable postfix.service
*If you check the status of postfix, you may notice that /usr/libexec/postfix/chroot-update exited with a status of 1 (failure). This is a known issue and is 'harmless'. It will not prevent postfix from working. If you wish, you can [[https://bugzilla.redhat.com/show_bug.cgi?id=832742 read more about it ]]
===Testing email using IP Addresses===
