Question and response
Question
dig mx142.emailfiltering.com. DNAME
Answer
The response has no answer records.
Authority
emailfiltering.com. 1800 SOA dell.ns.cloudflare.com. dns.cloudflare.com. 2395336644 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0