How do I stop my Email Campaigns from landing Gmail's Promotions?

Here are some tips stop your email campaigns from landing under Gmail's Promotions:

• Use the recipients' personal email addresses instead of non-existing email addresses or email aliases.
• If there's an image in the email, then:
  1. Do a right-click on the image.
  2. Go to Image Properties.
  3. Remove the width and height of the image.