title: How to create a swiftmailer message and attach it to another message
body: <p>We are using SwiftMailer in one of our functions who sends emails out.
  At the end, there is a general report sent to the department manager in order to keep trace and be informed about the function usage.</p>
  
  <p>The manager is now willing to also receive a copy of the email sent out, we could do this by adding one email copy as attachment to the email report.</p>
  
  <p>Any idea on how can we create a swiftmailer message and not sending it, only using it as attachment for a new swiftmailer email.</p>