mx2.electric.net.mx1.electric.net has no CNAME records.
Question and response
Question
dig mx2.electric.net.mx1.electric.net. NS
Answer
The response has no answer records.
Authority
mx1.electric.net. 2411 SOA ns1.electric.net. dns.electric.net. 1323043804 10000 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0