After hearing consistent feedback that you wanted more control over your contacts, we've changed the way Gmail suggests contacts to you. Up to this point, if you emailed someone five times, we'd automatically move them into My Contacts. Now, we'll no longer automatically add contacts to your My Contacts group. Instead, you can go to Suggested Contacts, select the contacts you'd like and move them into My Contacts. All of your contacts -- whether they're in My Contacts or Suggested Contacts -- will continue to show in auto-complete as you're composing messages.
As part of this change, we're moving previously auto-added contacts back into Suggested Contacts.