title: Force Exim to use ipv4 ip
body: <p>I have an unmanaged VPS that runs CentOS 7 Minimal. I have installed Exim for sending emails. My main server IP is IPv4 and I have an additional IPv6 address.</p>
  
  <p>Exim uses the IPv6 address to send emails. I want to overwrite this and use the IPv4 main server address. I added the <code>interface</code> line to the exim.conf:</p>
  
  <pre><code>remote_smtp:
     driver = smtp
     interface = x.x.x.x
  </code></pre>
  
  <p>And then restarted Exim but no matter what, it uses the IPv6 one. I thought that Exim is ignoring the config file but that's not the case as if I enter wrong IP format for interface and try sendmail, I get wrong IP format while sending email.</p>
  
  <p>I tried adding <code>disable_ipv6 = true</code> to the end of exim.conf but when I saved and restarted Exim, I got the following error when running Sendmail: "Option disable_ipv6 unknown"</p>
  
  <p>Thanks</p>