title: DSN: Service unavailable sendmail linux
body: <p>I just installed <code>sendmail</code> on my linux os.  </p>
  
  <p>I can't seem to receive emails, this is what I see in logs:</p>
  
  <pre><code>    Aug 10 14:12:10 localhost sendmail[13316]: v7A9CAPC013316: from=root, size=238, class=0, nrcpts=1, msgid=&lt;201708100912.v7A9CAPC013316@localhost.test&gt;, relay=root@localhost
  Aug 10 14:12:10 localhost sendmail[13317]: v7A9CAwD013317: from=&lt;root@localhost.test&gt;, size=484, class=0, nrcpts=1, msgid=&lt;201708100912.v7A9CAPC013316@localhost.test&gt;, proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1]
  Aug 10 14:12:10 localhost sendmail[13316]: v7A9CAPC013316: to=sandeelo.danyal@gmail.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30238, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (v7A9CAwD013317 Message accepted for delivery)
  Aug 10 14:12:12 localhost sendmail[13319]: STARTTLS=client, relay=gmail-smtp-in.l.google.com., version=TLSv1/SSLv3, verify=FAIL, cipher=ECDHE-RSA-AES128-GCM-SHA256, bits=128/128
  Aug 10 14:12:13 localhost sendmail[13319]: v7A9CAwD013317: to=&lt;sandeelo.danyal@gmail.com&gt;, ctladdr=&lt;root@localhost.test&gt; (0/0), delay=00:00:03, xdelay=00:00:03, mailer=esmtp, pri=120484, relay=gmail-smtp-in.l.google.com. [74.125.133.26], dsn=5.0.0, stat=Service unavailable
  Aug 10 14:12:13 localhost sendmail[13319]: v7A9CAwD013317: v7A9CDwD013319: DSN: Service unavailable
  Aug 10 14:12:13 localhost sendmail[13319]: v7A9CDwD013319: to=&lt;root@localhost.test&gt;, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31714, dsn=2.0.0, stat=Sent
  </code></pre>