az has no MX records.
Question and response
Question
dig az. MX
Answer
The response has no answer records.
Authority
az. 86400 SOA rip.psg.com. postmaster.insun.azerbaijan.su. 1773034885 14400 900 2592000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0