XEP-Remarks/XEP-0313: Message Archive Management

= Client-side Processing =

Forwarded messages MUST NOT be accepted from JIDs other than the user's bare account JID, or else:


 * CVE-2019-16235+ Multiple Vulnerabilities found in Dino
 * CVE-2017-5589+ Multiple XMPP Clients User Impersonation Vulnerability (similar, but not identical issue)

= Missing "Give the the last N messages starting from the oldest" query =