title: How to avoid marked as spam by Gmail on sending mass email?
body: <p>I created event registration web sites (you can imagine something like <a href="http://www.eventbrite.com/" rel="nofollow">http://www.eventbrite.com/</a>), which allow users to subscribe for event updates. When subscribed, we send mass emails (with the same content) to those users. </p>
  
  <p>It was ok before, but recently I noticed that GMail always put the email into Spam folder.
  As any texts would always go to Spam folder, I suspect that my domain was blacklisted by Gmail.</p>
  
  <p>1) Is there a way to request google to put my domain into the whitelist?</p>
  
  <p>2) Let's say it can't and I decide to register for new domain. 
  Is there a way to avoid the mass email to be marked as spam by Gmail? (may be something like what Facebook email notification do?)</p>