Amazon recently implemented a new option that allows the buyers to opt-out of unsolicited messages sent from third-party merchants. Buyers who turn on the "Do not send me any marketing email for now" in their Amazon account will no longer receive marketing messages from your Seller Account.
Our understanding right now is that once it is turned on by the buyer, all messages going to those buyers will be blocked. Until Amazon releases the opt-out status in the order or API, the only way to identify buyers who have opted out is through Amazon’s bounceback email.
To avoid sending further emails to those buyers who have opted out, BQool has designed the Global Blacklist for our users. The Global Blacklist is a shared database among all BQool Feedback Central users. Once we add a buyer in the Global Blacklist, we will no longer send emails to that buyer from any BQool user account.
To automate this, simply forward the Amazon opt out notification email to email@example.com and we will automatically add these shoppers to the global blacklist for you.
If you would like to know more about the new Buyer opt-out situation, please go to Buyer Opt-Out Email and What You Should Do.