I’ve just suggested an edit to a question which used xyz.com as a placeholder domain name. Lots of people are unfamiliar with RFC 2606RFC 2606, and therefore use domain names other than example{.com|.org|.net}
as placeholders. Such domain names are blocked from use on Stack Overflow according to a status-completed policy discussion, so why can they still be used here on Server Fault?
replaced http://tools.ietf.org/html/rfc with https://www.rfc-editor.org/rfc/rfc
replaced http://meta.stackexchange.com/ with https://meta.stackexchange.com/