ns1.promohosts.com has no MX records.
Question and response
Question
dig ns1.promohosts.com. MX
Answer
The response has no answer records.
Authority
promohosts.com. 1800 SOA ingrid.ns.cloudflare.com. dns.cloudflare.com. 2396502751 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0