Question and response
Question
dig mysmtp4.com. MX
Answer
mysmtp4.com. 600 MX 0 zmb-gate.mysmtp.com.
Authority
mysmtp4.com. 3600 NS pdns08.domaincontrol.com.
mysmtp4.com. 3600 NS pdns07.domaincontrol.com.
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0