mx1.1984.is has no CNAME records.
Question and response
Question
dig mx1.1984.is. NS
Answer
The response has no answer records.
Authority
1984.is. 10800 SOA ns0.1984.is. hostmaster.1984.is. 2014122814 3600 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0