fr has no MX records.
Question and response
Question
dig fr. MX
Answer
The response has no answer records.
Authority
fr. 600 SOA a.nic.fr. dnsmaster.afnic.fr. 2244358220 3600 1800 1209600 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0