delta.elf.stuba.sk has no MX records.
Question and response
Question
dig delta.elf.stuba.sk. MX
Answer
The response has no answer records.
Authority
elf.stuba.sk. 86400 SOA ns.stuba.sk. hostmaster.elf.stuba.sk. 2025112501 14400 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0