_spf.kyivstar.net has no MX records.
Question and response
Question
dig _spf.kyivstar.net. MX
Answer
The response has no answer records.
Authority
kyivstar.net. 600 SOA ns.kyivstar.net. hostmaster.kyivstar.net. 2026021902 3600 3600 3542400 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0