title: Using Rails 4 to send email with images
body: <p>Under the asset_host, <code>config.action_mailer.asset_host = "http://localhost:3000"</code> I am able to successfully preview emails to my specification without problems using:</p>
  
  <p><code>config.action_mailer.delivery_method = :letter_opener</code></p>
  
  <p>However, my email is being sent without images (maybe assets) using:</p>
  
  <p><code>config.action_mailer.delivery_method = :smtp</code></p>
  
  <p>What am I missing?</p>
  
  <p><em>Mailer view code</em></p>
  
  <pre><code>&lt;%= image_tag("#{image_path 'logo.png'}", :alt =&gt; "logo") %&gt;
  
  &lt;p&gt;Hi!&lt;/p&gt;
  ...
  </code></pre>