_spfs2.dl.sm.ua has no MX records.
Question and response
Question
dig _spfs2.dl.sm.ua. MX
Answer
The response has no answer records.
Authority
dl.sm.ua. 3600 SOA ns.auto.sumy.ua. hostmaster.dl.sm.ua. 2026022302 21600 3600 1382400 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0