mail.arctec.ro has no MX records.
Question and response
Question
dig mail.arctec.ro. MX
Answer
The response has no answer records.
Authority
ro. 3600 SOA primary.rotld.ro. hostmaster.rotld.ro. 2018309871 10800 3600 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0