Today, Amazon Simple Email Service (SES) launched a new feature giving customers the ability to set custom headers when sending emails using SES v2 sending APIs. Customers can now set headers for a variety of purposes, including implementing one-click unsubscribe by adding list-unsubscribe headers to emails. Custom headers are set when calling SES v2 sending APIs,and do not require raw email content. This makes it easier to support advanced use cases including those requiring “X-” proprietary header content.
Source:: Amazon AWS