title: postfix warning : group or other writable
body: <p>I am trying to configure the mail server with PHP postfix but I am getting this error like</p>
  <pre><code>       Apr 12 07:53:52 frlyonl0274 postfix/postfix-script[1593455]: warning: group or other writable: /etc/postfix/./main.cf
         Apr 12 07:53:52 frlyonl0274 postfix/postfix-script[1593467]: starting the Postfix mail system
         Apr 12 07:53:52 frlyonl0274 postfix/master[1593469]: daemon started -- version 3.5.8, configuration /etc/postfix
  </code></pre>
  <p>I changed inet_protocols = all to ipv4 and added compatibility_level=2 into the /etc/postfix/main.cf file but still I am unable to send mails. My project is running on rhel 8.I searched but didn't get any clue to solve it. Please help</p>