mx.stasofas.com has no NS records.
NS records for this zone are defined at stasofas.com.
NS records for this zone are defined at stasofas.com.
Question and response
Question
dig mx.stasofas.com. NS
Answer
The response has no answer records.
Authority
stasofas.com. 3600 SOA dns.stasofas.com. hostmaster.stasofas.com. 1305693990 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0