ink has no MX records.
Question and response
Question
dig ink. MX
Answer
The response has no answer records.
Authority
ink. 900 SOA a.nic.ink. admin.tldns.godaddy. 1771988207 1800 300 604800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0