title: SocketError with Mailboxer gem when not connected to the internet
body: <p>I am using the mailboxer gem.  When not connected to the internet and using my localhost, if I try to send a message from one user of my site to another user of my site, I get the following error:</p>
  
  <pre><code>SocketError (getaddrinfo: nodename nor servname provided, or not known):
  </code></pre>
  
  <p>What does this mean?  Is the gem somehow connected to mail boxer's servers?  I do not want to be dependent on someone else's servers for the internal messaging of my site, so I need to find out why mailboxer will not work if not connected to the internet?  If the gem is dependent on their servers, how do I know that they are not looking at the messages?</p>