Repeat after me, kids: SMTP != email. You need MX records, local MTAs, and client protocols (POP, IMAP, proprietary Exchange/Notes/etc.) at least to make a full

Repeat after me, kids: SMTP != email. You need MX records, local MTAs, and client protocols (POP, IMAP, proprietary Exchange/Notes/etc.) at least to make a full email stack. Furthermore, XMPP makes no provision for server-side storage and organization of messages. I for one consider that a huge step backwards, at least in terms of functionality.