I've tried all 3 of their IRC chat connections with 4 different computers. None of them found the path and all timed-out error.
Unable to connect,
Firefox can’t establish a connection to the server at chat.efnet.org:9090.
This site can’t be reached
chat.efnet.org refused to connect.
This page can’t be displayed
Make sure the web address http://chat.efnet.org:9090 is correct.
(Both IE and Edge)
Thus, email was the only option to use.