Lat.Level3.net has no MX records.
Question and response
Question
dig Lat.Level3.net. MX
Answer
The response has no answer records.
Authority
Lat.Level3.net. 3600 SOA ns1.Level3.net. dns.level3.net. 2024103100 7200 600 2592000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0