sleepy.lobo.net has no MX records.
Question and response
Question
dig sleepy.lobo.net. MX
Answer
The response has no answer records.
Authority
lobo.net. 1800 SOA sleepy.lobo.net. hostmaster.lobo.net. 2026022200 3600 3600 604800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0