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I wasn't aware XMPP wasn't secure? It supports TLS, SSL, OTR and more. Are there known issues?

The only problem is, that the server can see all messages. OTR solves this problem, but who use it? OTR would even solve the e-mail issue.

XMPP supports signing of messages, and for push notifications OTR is great.

I was under this impression too. I really like Jingle for encrypted voice calls, but if that is vulnerable I'd want to know!