title: Sendmail service is not starting and giving the error message on CentOS7
body: <p>I am trying to start sendmail service on centos7,but it gives me the below error message Which is very Vague. Could someone help me to identify the issue?</p>
  
  <pre><code>Apr 12 01:04:25 server.localdomain systemd[1]: Starting Sendmail Mail Transport Agent...
  Apr 12 01:04:25 server.localdomain systemd[1]: PID file /run/sendmail.pid not readable (yet?) after start.
  Apr 12 01:04:25 server.localdomain sendmail[3712]: starting daemon (8.14.7): SMTP+queueing@01:00:00
  Apr 12 01:05:55 server.localdomain systemd[1]: sendmail.service start operation timed out. Terminating.
  Apr 12 01:05:55 server.localdomain systemd[1]: Failed to start Sendmail Mail Transport Agent.
  Apr 12 01:05:55 server.localdomain systemd[1]: Unit sendmail.service entered failed state.
  Apr 12 01:05:55 server.localdomain systemd[1]: sendmail.service failed.
  </code></pre>
  
  <p>I am using centos7.</p>
  
  <pre><code>    #rpm -qa | grep -i sendmail
    sendmail-8.14.7-5.el7.x86_64
    sendmail-cf-8.14.7-5.el7.noarch
  </code></pre>
  
  <p>Is there any know issues with sendmail with centos7?</p>