Question and response
Question
dig tecenub.com. MX
Answer
tecenub.com. 1799 MX 5 mail.tecenub.com.
Authority
tecenub.com. 1800 NS dns1.registrar-servers.com.
tecenub.com. 1800 NS dns2.registrar-servers.com.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0
mail.tecenub.com. 1799 A 57.129.125.102