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| Acronym: XMPP | Extensible Messaging and Presence Protocol | 5 6 | idanchor = ietf }} This is a strength in comparison to non-multicasting protocols such as Simple Mail Transfer Protocol (SMTP) or Extensible Messaging and Presence Protocol (XMPP). ===Commands and replies=== IRC is based on a line-based structure with the client sending single-line messages to the server, {{cite IETF | rfc = 1459 | sectionname = Message forma |