_spf.host.md has no MX records.
Question and response
Question
dig _spf.host.md. MX
Answer
The response has no answer records.
Authority
host.md. 10800 SOA ns1.host.md. noc.host.md. 2026020301 10800 3600 604800 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0