ULTRADNS.BIZ has no MX records.
Question and response
Question
dig ULTRADNS.BIZ. MX
Answer
The response has no answer records.
Authority
ultradns.biz. 60 SOA pdns1.ultradns.net. domains.vercara.com. 2013042396 10800 3600 2592000 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0