– Cross posted from my post on the SharePoint Team blog, where you’ll find blogs from a great bunch of knowledgeable SharePoint support engineers. http://blogs.msdn.com/b/spses/archive/2015/03/04/requirements-for-sending-email-to-sharepoint-libraries-including-x-headers.aspx ———————————————————————————————————————————————————————————————————————————————————— There have been some questions around E-Mail requirements for sending email to a SharePoint list or library, and specifically around the need for the x-sender and x-receiver header fields.