sec-dns-a.rotld.ro has no MX records.
Question and response
Question
dig sec-dns-a.rotld.ro. MX
Answer
The response has no answer records.
Authority
rotld.ro. 900 SOA ns-a.rnc.ro. hostmaster.rotld.ro. 1772103806 3600 3600 604800 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0