charlie.sleepysquirrel.com has no MX records.
Question and response
Question
dig charlie.sleepysquirrel.com. MX
Answer
The response has no answer records.
Authority
sleepysquirrel.com. 3600 SOA ns1.sleepysquirrel.com. root.sleepysquirrel.com. 2025060882 1200 600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0