out-13.smtp.spacemail.com has no MX records.
Question and response
Question
dig out-13.smtp.spacemail.com. MX
Answer
The response has no answer records.
Authority
spacemail.com. 3600 SOA launch1.spaceship.com. support.spaceship.com. 1741869104 3600 1801 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0