jira.csgi.com has no MX records.
Question and response
Question
dig jira.csgi.com. MX
Answer
The response has no answer records.
Authority
csgi.com. 900 SOA ns1.csgsystems.com. postmaster.csgsystems.com. 20112138 900 600 1209600 900
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0