The requested feature is more like list-unsubscribe headers for mailing lists[1]. Instead of categorizing the mail as spam (blocking) you send a clean unsubscri

The requested feature is more like list-unsubscribe headers for mailing lists[1]. Instead of categorizing the mail as spam (blocking) you send a clean unsubscribe back to the sender. [1] https://www.twilio.com/en-us/blog/insights/list-unsubscribe https://www.twilio.com/en-us/blog/insights/list-unsubscribe