title: How to implement a simple newsletter/subscription system and mask recipients list
body: <p>I need to create a simple e-newsletter or subsciption system in PHP. At first, I thought of using PHPList for WordPress but the plugin is compatible only up to 2.9.2, if I recall correctly. </p>
  
  <ul>
  <li>how can I mask my recipients list?</li>
  <li>what must I consider to not have mails considered as spam?</li>
  <li>how to send mail in batches? </li>
  </ul>
  
  <p>I am open to use of plugins or 3rd party frameworks. I think they would provide valuable insight to create such a system from scratch.</p>