title: What is the best practice to send unlimited email using PHP
body: <p>We have a web site basically send daily 10K email notifications to users. I tried to use Google Apps but reach their daily limit quickly and then I create multiple accounts on godaddy and buy smtp relays (daily 250) to provide email notifications to our users..</p>
  
  <ul>
  <li><p>What is the best practice to provide it without being marked spam and small budget?</p></li>
  <li><p>Maybe I need to install postfix and dovecot?</p></li>
  </ul>