mail.flagman.zp.ua has no MX records.
Question and response
Question
dig mail.flagman.zp.ua. MX
Answer
The response has no answer records.
Authority
flagman.zp.ua. 10800 SOA ns.flagman.zp.ua. hostmaster.flagman.zp.ua. 2025091003 14400 7200 1209600 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0