mail.lactld.org has no MX records.
Question and response
Question
dig mail.lactld.org. MX
Answer
The response has no answer records.
Authority
lactld.org. 86400 SOA a.lactld.org. hostmaster.lactld.org. 2026022000 86400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0