vocsmail.com has no MX records.
Question and response
Question
dig vocsmail.com. MX
Answer
The response has no answer records.
Authority
vocsmail.com. 1800 SOA dom.ns.cloudflare.com. dns.cloudflare.com. 2396876896 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0