_spf1.fiberlink.com has no MX records.
Question and response
Question
dig _spf1.fiberlink.com. MX
Answer
The response has no answer records.
Authority
fiberlink.com. 500 SOA a1-64.akam.net. maas360-networkadmin.wwpdl.vnet.ibm.com. 2021070251 10800 3600 1209600 500
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0