casa has no MX records.
Question and response
Question
dig casa. MX
Answer
The response has no answer records.
Authority
casa. 900 SOA a.nic.casa. admin.tldns.godaddy. 1772147040 1800 300 604800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0