_spf3.mediacombb.net has no MX records.
Question and response
Question
dig _spf3.mediacombb.net. MX
Answer
The response has no answer records.
Authority
mediacombb.net. 300 SOA pdns104.ultradns.com. internetsupport.mediacomcc.com. 2021063180 10800 3600 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0