title: Rails action Mailer raise_delivery_errors, how does it works? How to detect bounces?
body: <p>I have a Rails 4.2.0 application which sends lots of mails, it's a elearning platfrom.</p>
  
  <p>At the moment I have problems with bounces, Lots of the Mails coming back because the Mail-Adresses aren't valid. </p>
  
  <p>One way is to solve the problem manually, starting deleting them from Database. But thats not suitable because there are about 10000 Users registered. </p>
  
  <p>Now my questsion is what is</p>
  
  <pre><code>config.action_mailer.raise_delivery_errors = true 
  </code></pre>
  
  <p>exactly? what does it do? and how do I get response from this?</p>
  
  <p>Does the <code>mail()</code> method got a return value where I can see If a mail was send or not?</p>
  
  <p>And are there methods or best practices to detect with the actionmailer, if a mail is delivered or not?</p>