nsb.xservers.ro has no MX records.
Question and response
Question
dig nsb.xservers.ro. MX
Answer
The response has no answer records.
Authority
xservers.ro. 1800 SOA norman.ns.cloudflare.com. dns.cloudflare.com. 2395280572 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0