Luckily there is a way out.
Don't use Email Swipes. YES, Gmail now looks at your emails same way it looks for duplicate content on Search Engine Spam control.
Imagine a new product is launched and 1000 affiliates send same swipe to all their lists, Google is smart enough to know you just copied and pasted.
Try to create original content, connect with your audience and give them something different than what other affiliates are sending them.
You will notice a great improvement in open rates and your mails will start going into inbox soon and not in promotions tab