FastMail shutters XMPP:
#^Shutting down our XMPP chat service | FastMail Blog http://blog.fastmail.com/2015/11/16/shutting-down-our-xmpp-chat-service/ Quick summary: We’ll be closing down our XMPP chat server on 31 January 2016. For users with a FastMail domain account (e.g. @fastmail.com, @eml.cc, etc), XMPP messaging with your account will be unavailable after this date. If you have your own domain for your account, you’ll have to find an alternative XMPP server and change your SRV DNS records as appropriate if you wish to continue using XMPP with your domain.

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