yesteryear.npdog.org has no MX records.
Question and response
Question
dig yesteryear.npdog.org. MX
Answer
The response has no answer records.
Authority
npdog.org. 28800 SOA ns1.dyna-ns.net. hostmaster.npdog.org. 2026030601 16384 2048 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0