ultradns.info has no MX records.
Question and response
Question
dig ultradns.info. MX
Answer
The response has no answer records.
Authority
ultradns.info. 60 SOA pdns196.ultradns.net. domains.vercara.com. 2014031846 10800 3600 2592000 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0