lua.pet has no MX records.
Question and response
Question
dig lua.pet. MX
Answer
The response has no answer records.
Authority
lua.pet. 172800 SOA ns1.he.net. hostmaster.he.net. 2025123103 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0