Are Emojis Allowed in XMPP Addresses?
Summary
Georg Lukas analyzes emoji support in XMPP addresses, tracing the evolution of internationalized strings from IDNA2003 and Stringprep to PRECIS and IDNA2008. The piece explains how the localpart, domainpart, and resourcepart are validated and what characters remain allowed, with emphasis on the difficulties and real-world implications for XMPP servers and clients.