_spf.vcn.com has no MX records.
Question and response
Question
dig _spf.vcn.com. MX
Answer
The response has no answer records.
Authority
_spf.vcn.com. 3600 SOA ns1.vcn.com. root.vcn.com. 2022113002 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1432, xrcode 0, version 0, flags 0